ch2分析试样的采集与制备习题解

ch2分析试样的采集与制备

习题p37-1,4,5

1．某种物料，如各个采样单元间标准偏差的估计值为0.61%，允许的误差为0.48%，测定8次，置信水平选定为90%，则采样单元数应为多少？

解：n=8，f=7 P=90% 查p61表3-3可知t=1.90

根据p25公式（2-1）： 采样单元数6≈8.5=)48

.061.0×90.1(=)(=22E σt n 4.已知铅锌矿的K 值为0.1，若矿石的最大颗粒直径为30mm ，问最少应采取试样多少千克才有代表性？

解：Q≥Kd 2=0.1×302

=90(kg)

5.采取锰矿试样15kg ，经粉碎后矿石的最大颗粒直径为2mm ，K 值为0.3，问可缩分至多少千克？

解：最少应采取试样Q≥Kd2=0.3×22=1.2(kg) 才有代表性。设:缩分n次，

则Q×(1/2)n ≥1.2(kg)，

15×(1/2)n ≥1.2(kg)，

ln15+n×ln(1/2) ≥ ln1.2

解得：n＜3.6，所以=3，=15×(1/2)3=1.875(kg)

第二章试样的采取与制备答案

第二章试样的采取与制备答案 1、试样的制备过程一般包括几个步骤？ 答：从实验室样品到分析试样的这一处理过程称为试样的制备。 试样的制备一般需要经过破碎、过筛、混合、缩分等步骤。 一、破碎 破碎可分为粗碎、中碎、细碎和粉碎4个阶段。根据实验室样品的颗粒大小、破碎的难易程度，可采用人工或机械的方法逐步破碎，直至达到规定的粒度。 由于无需将整个实验室样品都制备成分析试样，因此，在破碎的每一阶段，需要包括破碎、过筛、混匀和缩分四个步骤，直至减量成为分析试样。 应该指出，因矿石中难碎的粗粒与易碎的细粒的成分不同，为了保证试样的代表性，所有粒块均应磨碎，不应弃去难磨的部分。破碎时还应避免引入杂质。 二、过筛 物料在破碎过程中，每次磨碎后均需过筛，未通过筛孔的粗粒再磨碎，直至样品全部通过指定的筛子为止(易分解的试样过170目筛，难分解的试样过200目筛)。试样过筛常用的筛子为标准筛，一般为铜网或不锈钢网。 筛孔径大小与筛号的关系如表2-4所示： 表2-4 筛号（网目）与筛孔径大小的关系 筛号(网号) 5 10 20 40 60 80 100 120 170 200 筛孔mm 4.00 2.00 0.83 0.42 0.25 0.177 0.149 0.125 0.088 0.074 注：网目是指１英寸（25.4mm）筛网边长上的筛孔的数目 三、混匀 混匀法通常有铁铲法或环锥法、掀角法。 铁铲法或环锥法常用于手工混合大量实验室样品。如铁铲法是在光滑而干净的混凝土或木制平台上，用铁铲将物料往一中心堆积成一圆锥，然后从锥底一铲一铲将物料铲起，重新堆成另一个圆锥，来回翻倒数次。操作时物料必须从锥堆顶部自然洒落，使样品充分混合均匀。 掀角法常用于少量细碎样品的混匀。将样品放在光滑的塑料布上，提起塑料布的两个对角使样品在水平面上沿塑料布的对角线来回翻滚，第二次提起塑料布的另外两个对角进行翻滚，如此调换翻滚多次，直至物料混合均匀。 也可采用机械混匀器进行混匀。 四、缩分 缩分是在不改变物料的平均组成的情况下，逐步缩小试样量的过程。因为不可能把全部实验室样品都加工成分析试样，随着样品的磨碎，粒度变小，样品的最低可靠质量减少，所以要不断地进行缩分。缩分的方法，常用的有锥形四 分法、正方形挖取法和分样器缩分法。 1．锥形四分法 将混合均匀的样品堆成圆锥形，用铲子将锥顶压 平成截锥体，通过截面圆心将锥体分成四等份，弃去 任一相对两等份，如图2-7所示。将剩下的两等份收 集在一起再混匀。这样就缩减一半，称为缩分一次。 如需要再行缩分，按上述方法重复即可。

第2章 分析试样的采集与制备答案

第2章分析试样的采集与制备 思考题 1. 为了探讨某江河地段底泥中工业污染物的聚集情况，某单位于不同地段采集足够量的原始平均试样，混匀后，取部分试样送交分析部门。分析人员称取一定量试样，经处理后，用不同方法测定其中有害化学成分的含量。试问这样做对不对？为什么？ 答： 采集的原始平均试样混匀后，取部分试样送交分析部门。样品不具代表性。采集的原始平均试样混匀后，还须研磨、过筛、缩分，才能使送交分析部门试样代表所采集样品的平均化学成分。 2. 分解无机试样和有机试样的主要区别有那些？ 答： 分解无机试样最常用的方法是溶解法和熔融法；测定有机试样中的无机元素时，则通常采用干式灰化（高温分解和氧瓶燃烧法）和湿式消化法分解试样。主要区别有： 1．分解无机试样的熔融法和分解有机试样的干式灰化法虽然都是在高温进行的，但其作用不同，且熔融法需要溶剂。熔融法是借助高温使试样与熔剂熔融以形成能水溶或酸溶的形态；而干式灰化法是借助高温使有机试样燃烧以消除有机物的干扰，燃烧后留下的残渣可用酸提取。 2．分解无机试样的溶解法和分解有机试样的湿式消化法虽有相似之处，但所用溶剂和其作用也不同。湿式消化法采用HNO3或HNO3与H2SO4、HNO3与HClO4混酸作溶剂，利用HNO3的氧化性破坏有机物以消除其干扰；溶解法使用的溶剂有水、酸、碱或各种混酸，依据试样的性质和待测元素选择适当的溶剂，以使试样成为水溶的形态。 3．分解无机试样和有机试样的主要区别在于：无机试样的分解时将待测物转化为离子，而有机试样的分解主要是破坏有机物，将其中的卤素，硫，磷及金属元素等元素转化为离子。 3. 欲测定锌合金中Fe, Ni, Mg的含量，应采用什么溶剂溶解试样？ 答： 应采用NaOH溶液溶解试样。因为NaOH与Fe, Ni, Mg形成氢氧化物沉淀，可与锌基体分离。 4. 欲测定硅酸盐中SiO2的含量；硅酸盐中Fe, Al, Ca, Mg, Ti的含量。应分别选用什么方法分解试样？答： 测定硅酸盐中SiO2的含量，用KOH熔融分解试样；测定硅酸盐中Fe, Al, Ca, Mg, Ti的含量，用 HF-HClO4-H2SO4混酸作溶剂分解试样。 5. 镍币中含有少量铜、银。欲测定其中铜、银的含量，有人将镍币的表面擦洁后，直接用稀HNO3溶解部分镍币制备试液。根据称量镍币在溶解前后的质量之差，确定试样的质量。然后用不同的方法测定试液中铜、银的含量。试问这样做对不对？为什么？ 答： 不对。因为镍币表层和内层的铜和银含量不同。只溶解表层部分镍币制备试液，测其含量，所得结果不能代表整个镍币中的铜和银含量。 6. 怎样溶解下列试样：锡青铜，高钨钢，纯铝，银币，玻璃（不测硅）。 7. 下列试样宜采用什么熔剂和坩埚进行熔融：铬铁矿，金红石（TiO2），锡石（SnO2），陶瓷。 习题

外贸函电翻译参考答案修订稿

外贸函电翻译参考答案 WEIHUA system office room 【WEIHUA 16H-WEIHUA WEIHUA8Q8-

Lesson 2 1. We avail ourselves of this opportunity to introduce to you as a foreign-invested corporation specializing in arts and crafts. 2. We want to acquaint ourselves with the supply position of steel products。 3 We are enclosing a cope of pricelist. have 28 distributors across the world. 5. We are one of the leading exporters of Chinese industrial products and are desirous of entering into business relations you. Lesson 3 are a dealer in Egypt.。 2. I have?2 years of?follow-up purchase orders and shipping experience 3. We have pictures of sports shoes selling well in UK. 4. We are sending some samples and brochures under separate cover for your reference. 5. We are interested in the electric appliance in your sample. Please kindly send your quotations to us. 6. We’d like to inform that you’ll find our new products are at Stand 16. Lesson 4 1. We are looking for a reliable supplier who can provide us the laptop. 2. I would like to buy computers and computer parts. Please send me a detailed pricelist with min. Order and shipping costs.

第二章 试样采集与制备

第2章 分析试样的采集与制备 1. 某种物料，如各个采样单元间标准偏差的估计值为0.61%，允许的误差为0.48%，测定8次，置信水平选定为90%，则采样单元数应为多少？ 解： 22 0.10,71.900.61%5.8360.48%t n E σ?????===≈ ? ?? ???份 2. 某物料取得8份试样，经分别处理后测得其中硫酸钙量的标准偏差为0.13%，如果允许的误差为0.20%，置信水平选定为95%，则在分析同样的物料时，应选取多少个采样单元？ 解： 220.05,72.360.13%2.3530.20%t n E σ?????===≈ ? ?????份 3. 一批物料总共400捆，各捆间标准偏差的估计值σ为0.40%，如果允许误差为0.50%，假定测定的置信水平为90%，试计算采样时的基本单位数。 解： 测定次数未知 4. 已知铅锌矿的K 值为0.1，若矿石的最大颗粒直径为30 mm ，问最少应采取试样多少千克才有代表性？ 解： 220.13090 kg Q Kd ≥=?= 5. 采取锰矿试样15 kg ，经粉碎后矿石的最大颗粒直径为2 mm ，设K 值为0.3，问可缩分至多少克？ 解：

2230.32 1.2 kg 115 1.232115 1.875 kg 2n Q Kd n ≥=?=???≥?= ??? ???= ??? 则可缩分至 6. 分析新采的土壤试样，得如下结果：H 2O 5.23%，烧失量16.35%，SiO 2 3 7.92%，Al 2O 3 25.91%, Fe 2O 3 9.12%，CaO 3.24%，MgO 1.21%，K 2O+Na 2O 1.02%。将样品烘干，除去水分，计算各成分在烘干土中的质量分数。 解： 223232216.35%100%17.25%100 5.23 37.92SiO %100%40.01%100 5.23 25.91Al O %100%27.34%100 5.23 9.12Fe O %100%9.62%100 5.23 3.24CaO%100% 3.42%100 5.23 1.21MgO%100% 1.28%100 5.23 1.02K O+Na O%100 5.2= ?=-=?=-=?=-=?=-=?=-=?=-=-烧失量100% 1.08%3?=

外贸函电课后练习答案

Unit 2 Establishing Business Relations & Inquiring Credit Reference I. Translate the following sentences into English. 1. We are one of the leading importers dealing in electronic products in the area, and take this opportunity to approach you, in the hoping of establishing business relations. 2. We have been engaged in handling importing and exporting of machinery and equipment for many years, and our products have enjoyed great popularity in many countries. 3. We owe your name and address to the Commercial Counselor’s office of our Embassy in Beijing. 4. We are given to understand that you are a manufacturer of daily chemicals. One of our clients intends to buy cosmetics from your country. We will appreciate it highly if you airmail the catalogue and price list of the goods available at present. 5. For our credit standing, please refer to the Bank of China, Shanghai Branch. II. Write a letter Dear Sirs, We have obtained your name and address from the Commercial Counsel of your Embassy in Beijing and are pleased to write to establish business relations with you. We are informed that you are in the market for Chinese Cotton Piece Goods, and this item falls with the scope of our business activities. To acquaint you with our goods available for export, we are enclosing a catalogue and price list. We are looking forward to your early reply. Faithfully yours, Unit 3 Enquiries and Replies II. Translate the following sentences into English. 1. Please quote us your best price CIF Shanghai, including our 3% commission. 2. Should your price be found competitive, we intend to place an order with you for 300,000 yards of Cotton Cloth. 3. One of our customers is now interested in the Qingdao Haier Refrigerator made in your country. Please offer CIF London for 400 sets to be delivered in April.

第2章分析试样的采集与制备答案

第2章分析试样的采集与制备答案 1.答：不对。按该法测出的结果是整个河道有害化学成分的含量，不能反映染物聚集情况，即分布情况，应将试样分河段进行分析。 2.答：分解无机试样通常采用溶解法和熔融法，将试样的组分溶解到溶剂中。对于有机试样来说，通常采用干式灰化法或湿式消化法。前者是将试样置于马弗炉中加高温分解，有机物燃烧后留下的机残渣以酸提取后制备成分析试液。湿式消化法使用硝酸和硫酸混合物作为溶剂与试样一同加热煮解，对于含有易形成挥发性化合物（如氮、砷、汞等）的试样，一般采用蒸馏法分解。 3.答：用HCl 或NaOH 溶解。后者可将Fe ，Ni ，Mg 形成氢氧化物沉淀，可与锌基体分离，但溶解速度较慢。 4.答：测定硅酸盐中SiO 2的含量，用KOH 熔融分解试样；测定硅酸盐中Fe ，Al ，Ca ，Mg ，Ti 的含量，用HF-HClO 4-H 2SO 2混酸作溶剂分解试样。 5.答：不对。因为镍币表层和内层的铜和银含量不同。只溶解表层部分镍币制备试液，测其含量，所得结果不能代表整个镍币中的铜和银含量。 6.答：锡青铜：HNO3；高钨钢：H3PO4；纯铝：HCl ；镍币：HNO3；玻璃：HF 。 7.答：铬铁矿：Na 2O 2熔剂，铁、银、刚玉坩埚 金红石：酸性熔剂，石英或铂坩埚 锡石：酸性熔剂，石英或铂坩埚 陶瓷：碱性熔剂，铁、银、刚玉坩埚 8.解：f =7，P =90%查表可知t =1.90 221.900.61(( 5.860.48 t n E σ×===≈9.解：f =7，P =95%查表可知t =2.36 84.7%20.0%23.036.22 ≈=?? ????×=n 10.解：先假设采样单元数为∞，P =90%查表可知t =1.64 221 1.640.40% 4.850.30%t n E σ×????===≈????????n =6时，查表t =2.02，则 2 2 2.020.40%7.380.30%n ×??==≈????n =7时，查表t =1.94，则

外贸函电翻译参考答案

Lesson 2 1. We avail ourselves of this opportunity to introduce to you as a foreign-invested corporation specializing in arts and crafts. 2. We want to acquaint ourselves with the supply position of steel products。 3 We are enclosing a cope of pricelist. have 28 distributors across the world. 5. We are one of the leading exporters of Chinese industrial products and are desirous of entering into business relations you. Lesson 3 are a dealer in Egypt.。 2. I have?2 years of?follow-up purchase orders and shipping experience 3. We have pictures of sports shoes selling well in UK. 4. We are sending some samples and brochures under

separate cover for your reference. 5. We are interested in the electric appliance in your sample. Please kindly send your quotations to us. 6. We'd like to inform that you'll find our new products are at Stand 16. Lesson 4 1. We are looking for a reliable supplier who can provide us the laptop. 2. I would like to buy computers and computer parts. Please send me a detailed pricelist with min. Order and shipping costs. 3 Regarding the model we attached here, our target price is for our market. 4. We allow you a discount of 3% for quantity over 1000 pieces of the offered item. 5. As regards our financial standing, please refer to the Bank of China, Shanghai Branch. Lesson 5

外贸函电课后练习答案大全

选择题 第二单元：询价与回复 一：1.You name D. has been recommended to us by the Chamber of Commerce in New York.. 2. Our market survey informs us that you are A. in the market for Audio and Electronic Equipment. 3. We should be pleased to receive you’re A. illustrated catalogue and price list. 4. We are B. well-established exporters of all kinds of Chinese good. 5. If your price are competitive, we are confident D. in selling the goods in great quantities in this market. 6. We shall appreciate B. your quoting us FOB Sydney. 7. As we are one of the leading importers in this line, we are B. in a position to handle large quantities. 第三单元：资信调查 一：1.For information D. concerning our credit standing we refer you to Bank of China, Shanghai Branch. 2. We should be grateful if you would say C. whether they are likely to be reliable for a credit up to USS20.000. 3. Any information you kindly give us will be treated in strict confidence and A. without any responsibility on your part. 4. Will you please inform us, B. in confidence, of the extent of their resources and also as to their reputation? 5. D. While appreciating your decision to place regular orders with us, we respectfully request that you furnish us two references for the initial purchase. 第四单元：促销 1.（C、Having made）a special purchase of toys on very favorable terms, we are able to offer to you at the following attractive prices 2 we can only（A、hold open）this very advantageous offer for a few weeks.. 3 the recent advance in the cost of raw materials （B、has compelled）us to make a slight increase in the Prices 4 although costs have been （C、rising）steadily since last October , we have not yet （raised）our prices 5 （B、with a view to ）supporting your sales, we are sending some samples of our new makes. 第五单元：报盘与还盘 1A comparison of your offer （A、with that of ）our regular suppliers shows that their figures are more favorable. 2 If your prices are competitive, we are confident（D、in selling）the goods in great quantities in this market. 3 we confirm our fax just sent （A、offering you firm）these goods. 4 we offer you the following items（D、subject to）your reply reaching here by 4p.m today our time. 5 although we appreciate good quality of your goods, we are sorry to say that your prices appears to be（C、on the high side）. 6 we trust that we may be （C、favored）with a continuance of your valued orders. 7 we hope that you will see your way to （B、grant）us your order, and assure you in advance of its most careful execution 8 not having heard from you since, we should be glad to know whether there is any disadvantage in our terms which we could （B、remove）. 9 you are （C、assured）that we will quote our best prices as soon as we are told what products of ours you need. 10 in all probability this offer will not be （A、repeated）for some time, and we according look forward to receiving an early reply from you. 第六单元: 订单 一、Fill in the blanks with your choices 1.This order the sample you sent us on March 24.（A、is placed on） 2.We hope you will give your usual best attention this order.（B、to the execution of） 3.We have decided to place a trial order for the following stated in your letter.（B、on the terms） 4.we would like to supply you with the product, we are unable to fill your order owing to the heavy backlog of commitments. (B、Much as) 5.We must apologize you being unable to fill your present order.（D、To… for ） 6.We have accepted your Order No.234. Please open the relevant L/C,here two weeks prior to the date of shipment.（A、which must reach） 7.We are enclosing our latest catalogue some of the items may be of interest to you.（C、in the hope that） 8.The order is given strictly on the condition that shipment must be made not later than the first day of May.（B、enclosed） 第七单元：支付 一、单选 1.As requested, we have immediately arranged (A、with) our bankers to extend the expiry date of our L/C for two weeks (up to) 10th March. 2.As arranged, we would ask you to open an irrevocable credit in (C、our) favor and shall hand over shipping documents (against) acceptance of our draft. 3.We inform you that we have opened an irrevocable credit (D、with) the London Bank in your favor. 4.We advised the bank to amend the clause (D、to read)“partial shipment are permitted”. 5.We enclose our cheque for US$ 200 (A、in payment of) your invoice No.D-124. 第九单元：保险 一：选择题 1: please insure the goods (A、against) F.P.A. for US 100,000. 注：against加险别for加保额 2: please effect insurance (D、on) the cargo for US50,000 by S.S.Bright from Tianjin to seattle. 3: we have opened insurance you ordered for US9,000 (D、on) the shipment by S.S.East sun. 4: we wish to renew the above policy (C、for) the same amount and (on)the same terms as before to cover our consignment to be shipped b s.s.bright next month. 5: as requester, we have covered insurance (on) 20,000 DVD players (at) 10% above the invoice value (against) all risks. 6: unless we hear from you (A、to) the contrary before the end of this month, we shall arrange to cover the goods against t p a for the value of the goods plus freight. 7: any additional coverage（险别）other (B、than) ISS shall be for the account of the buyer. 8: we confirm that we hold the consignment covered as (from) today. 9: we have arranged (A、for) surveyor to investigate the extent of the damage and shall forward his report together with our claim. 10: we understand that these terms will apply (C、to)all our shipments of bottled sherry by regular liners to west European ports. 完形填空 第二单元：Fill in each blank in the letter below with a word that fits naturally.

第十四章 分析试样的采集与制备

第十四章分析试样的采集与制备 目的要求： 通过本章教学，使学生了解固体试样、液体试样、气体试样及生物试样的采集方法；掌握试样的制备方法；掌握常用的试样分解方法：溶解法、熔融法，了解试样分解的其它方法；了解并理解分析测定前的预处理。 教学重点：试样的分解； 教学难点：根据试样特点确定试样分解方法 教学内容： 2-1 试样的采集 ?在分析实践中，常需测定大量物料中某些组分的平均含量. ?取样的基本要求：代表性 ?对比较均匀的物料，如气体、液体和固体试剂等，可直接取少量分析试样，不需再进行制备。 ?通常遇到的分析对象，从形态来分，不外气体、液体和固体三类，对于不同的形态和不同的物料，应采取不同的取样方法。 2.1.1 固体试样的采集 固体物料种类繁多，性质和均匀程度差别较大。 ?组成不均匀的物料: 矿石,煤炭,废渣和土壤等； ?组成相对均匀的物料：谷物、金属材料、化肥、水泥等。 对不均匀试样，应按照一定方式选取不同点进行采样，以保证所采试样的代表性。 ?采样点的选择方法：随即采样法；判断采样法；系统采样法等。 ?取样份数越多越有代表性，但所耗人力、物力将大大增加。应以满足要求为原则。 ?平均试样采取量与试样的均匀程度、颗粒大小等因素有关。通常，试样量可按下面经验公式(切桥特公式)计算： m ≥ Kd 2 式中：m为采取平均试样的最低重量(kg)；d 为试样的最大颗粒直径(mm)；K 为经验常数，可由实验求得，通常K 值在0.05 - 1之间。 例：采集矿石样品，若试样的最大直径为10 mm，k=0.2 kg/mm2, 则应采集多少试样？ 解：m≥kd2 = 0.2 10 2 = 20 (kg)

土壤分析样品的采集和处理方法

土壤分析样品的采集和 处理方法 标准化管理部编码-[99968T-6889628-J68568-1689N]

Ⅰ-土壤分析样品的采集和处理方法配方施肥是一种以最少的肥料投入得到农作物最高产量的农业新技术，这一技术的基础是测出土壤中已有的养分含量，然后根据种植作物的品种、目标产量决定该施什么肥、施多少肥。 土壤样品采集是决定分析结果是否准确的重要环节，因此请严格按下列方法采集土样。 对作物根系较浅的种植地只需取耕层20厘米深的土壤，对作物根系较深的种植地如小麦应适当增加深度，果园土壤样品在耕层40厘米深处采集，采样点的多少可根据试验区耕地面积大小和地形而定，地块面积较小的要采5个点以上，地块面积较大的应采20个点以上。取样点的分布最好采用S型采样法或十字交叉法。（见图一） 采来的样品数量太多可用四分法弃去一部分保留1斤土样即可（见图二）。其方法是：把采来的土样倒在干净的木板或塑料布上，用手将土块捏碎，用镊子夹去土样中的作物根系、昆虫、石块等杂物，放于室内阴凉通风处风干，注意不能在阳光下曝晒及火烤，以免发生氧化反应。把风干后的土样用木棍或玻璃瓶碾碎（不可用金属制品），然后用1—2毫米筛子筛一遍。把筛过的土样平铺成四方形，如数量仍然很多，可再用四分法处理，直至所需数量为止，一般用50克土样即可，完成土样处理后，请填写土壤登记表。 注：如一户有几个土样或几户各有一个土样可将土壤登记表分别填好，并在土样包装上做上与登记表同样内容的标记，以免搞错。 避免在粪堆底上和同一垄上以及田边，路边，沟边和特殊地形部位采样。 采样时在确定的采样点上用小土铲向下切取一片片的土样样品，每个样品点采取的土壤厚、薄、深、浅、宽、狭应大体一致，集中起来混合均匀。 有机肥分析样品的采集和处理方法：堆肥、厩肥、沤肥、草塘肥、沼气肥、牲畜粪尿以及人粪尿等都是有机肥，这些肥料大都是很不均匀的，采样时应注意多点取样，一般应在翻堆混匀后，选择10—20个采样点，大块和散碎的肥料比例相近，把采到的若干样品放在一块干净的塑料布上，送入室中风干，摊开晾干，再把样品弄碎、剪细、混匀，再用四分法缩分至500克左右，磨细并全部通过1毫米孔径筛子，装入样品瓶中。 如果有机肥样品中夹有较多石块，应捡出另外称重，并计算其占原有样品的百分数，如需测定有机肥料中的NH4和NO3，则需用新鲜样品，即不经风干立即进行测定。 粪尿和沼气肥是液体和固体混合肥，可先混匀在未分层前取出500毫升左右放入密闭容器中，用玻璃棒将固体充分捣碎，在分析称样前应反复振摇容器充分混匀。 四分法： Ⅱ-土壤养份测试方法

外贸函电Ch3参考答案

Ch3 I. Choose the best answer: 1.The letter we sent last week is an enquiry ______colour TV sets. A. about B. for C. of D. as 2.We will consider ______your terms of payment. A. accepted B. to accept C. accepting D. accept 3.Should your price ______reasonable, we will place an order _______you. A. is, with B. are, from C. is, from D. be, with 4.We are pleased to say that we are ______to supply you ______the goods you want. A. of a position, for B. at a position, for C. in a position, with D. at a position, with 5.One of our clients is ______the market _______Men's Shirt. A. on, of B. at, with C. in, for D. with, at 6.There is a steady demand here ______leather gloves of high quality. A. in B. of C. for D. on 7._______your prices are right, you will find a ready market for your products. A. Should B. To provide C. Provided D. Provide 8.We can supply all items ______the requirements of a fashionable trade as yours. A. to be met B. to meeting C. to meet D. meet 9.We find your terms ______and now send you our Order No.1234. A. satisfied B. satisfaction C. satisfactory D. satisfactorily 10.CIF stands ______cost, insurance and freight. A. by B. as C. like D. for BCACC CCCCD II. Fill in the blanks with proper prepositions: 1.Please send us ______airmail your export catalogue showing the different lines ______which you chiefly deal. 2.______ your request, we have pleasure ______sending you herewith a copy of our catalogue. 3.We are in the market ______China Black Tea and shall be pleased if you will let us have your catalogue together ______price lists. 4.This is ______reply to your enquiry of April 4 and we are now sending you a quotation sheet ______your consideration. 5.We regret to inform you that we are not ______a position to supply you ______the captioned goods. 6.As the goods you enquire ______for are ______a short supply, we are offering you Art. No. 123 as a substitute. 7.The goods we quote ______ is very close ______your specifications. 8.You may be pleased to learn that there is a great demand here ______your Green Tea _____our district. 9.We are large dealers ______native products and feel confident there is a promising market ______moderately priced goods of the kind mentioned. 10.We shall be pleased if you will make us an offer ______Five Rams Brand Bicycles ______ your most favourable price. 11.Please send us your price list for New Crop Soybeans , ______which we can place a large order ______prompt shipment.