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2018届二轮(理)高考小题集训(一)专题卷(全国通用)

2018届二轮(理)高考小题集训(一)专题卷(全国通用)
2018届二轮(理)高考小题集训(一)专题卷(全国通用)

则程序执行后的结果是()

该程序框图的算法功能为利用辗转相除法求

的最大公约数为4,故选

湖南省五市十校联考)如图,小方格是边长为一个几何体的三视图如图所示,则几何体的表面积为

(25+6)π+96

D.(45+4)π+96

几何体为一个圆锥和一个正方体的组合体,

,底面半径长为2,几何体的表面积为

=(45+4)π+96.

A.169

16π B .8π C.28916π D.2516π

解析:如图所示,当点D 位于球的正顶部时四面体的体积最大,设球的半径为R ,则四面体的高为h =R +R 2-1,四面体的体积为

V =13×12×(3)2×sin60°×(R +R 2-1)=34×(R +R 2-1)=3,解

得R =178,所以球的表面积S =4πR 2

=4π? ??

??1782=289π16,故选C.

答案:C

9.若两个非零向量a ,b 满足|a +b |=|a -b |=2|a |,则向量a +b 与a -b 的夹角是( )

A.π6

B.π3

C.2π3

D.5π6

解析:在直角三角形中,如果直角边为斜边的一半,则该直角边

所对的角为π6,如图,所求的夹角为2π

3,故选C.

答案:C

10.已知函数f (x )=???

3x ,x ≤1,

log 13x ,x >1,

则函数y =f (1-x )的大致图

象是( )

解析:当x =0时,y =f (1)=3,即y =f (1-x )的图象过点(0,3),排除A ;当x =-2时,y =f (3)=-1,即y =f (1-x )的图象过点(-2,

乙车最多可行驶5千米以相同速度行驶相同路程,三辆车中,

小时的速度行驶1小时某城市机动车最高限速80千米/小时,市用丙车比用乙车更省油

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2018届高考物理二轮复习热点2滑块—木板模型学案

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A .F >μ(2m +M )g B .F >μ(m +2M )g C .F >2μmg D .F >2μ(m +M )g [解析] 要使A 能从B 、C 间抽出来,则A 要相对于B 、C 都滑动,所以A 、C 间与A 、B 间都是滑动摩擦力,对A 有a A =F -μmg -μM +m g M ,对C 有a C =μmg m ,B 受到A 对B 的水平向右的滑动摩擦力μ(M +m )g 和地面对B 的摩擦力f ,由于f ≤μ(2M +m )g ,所以A 刚要从B 、C 间抽出时,B 静止不动,即a A >a C 时,A 能从B 、C 间抽出,得F >2μ(M +m )g ,D 对. [答案] D 3.(2017·广州模拟)如图所示,光滑水平面上放置质量分别为m 、2m 和3m 的三个木块,其中质量为2m 和3m 的木块间用一根不可伸长的轻绳相连,轻绳能承受的最大拉力为F 0;质 量为m 和2m 的木块间的最大静摩擦力为12 F 0.现用水平拉力F 拉质量为3m 的木块,使三个木块一起加速运动,下列说法正确的是( ) A .质量为2m 的木块受到四个力的作用 B .当F 逐渐增大到F 0时,轻绳刚好被拉断 C .在轻绳未被拉断前,当F 逐渐增大时,轻绳上的拉力也随之增大,并且大小总等于F 大小的一半 D .在轻绳被拉断之前,质量为m 和2m 的木块间已经发生相对滑动 [解析] 质量为2m 的木块受到5个力的作用,重力、拉力、压力、支持力和摩擦力,则选项A 错误;对三者整体,应用牛顿第二定律有F =6ma ,对质量为m 和2m 的木块整体,同理有,轻绳拉力T =3ma =F 2,隔离质量为m 的木块,有f =ma =F 6 ,可知在轻绳未被拉断前,当F 逐渐增大时,轻绳上的拉力也随之增大,并且大小总等于F 大小的一半,则选项C 正确;当F 逐渐增大到F 0时,轻绳拉力T =F 0 2,轻绳没有达到最大拉力不会被拉断,则选项B 错误;

2019年高考英语二轮复习专题一 名词

1.学生了解高考中名词的考查方向:可数/不可数;名词单复数;词形转换及所有格 2.学生识记常见的不可数名词 3.学生掌握名词变复数的基本规则及常见不规则变化名词 4.学生能熟练转换词形 Teaching emphasis and difficulties: 1.易考的不可数名词。 2.名词的单复数变化及其特例。 3.名词词性变化。 Teaching procedures: Part 1 感知高考 1.Finish the following exercises: (2018全国卷1)a mere five to ten minutes a day of running reduced the risk of heart disease and early deaths from all __________ (cause) (2017 全国卷1) This trend ...has had some unintended side __________ (effect)such as overweight and heart disease. (2018全国卷1)They had a big separate house to raise dozens of chicken. (2017 全国卷1) The instructor kept repeating the word “ speed up !” “ slow down!” 2.Present learning goals. Part 2 考点剖析 考点一:常见的不可数名词 1.advice 2.equipment 3.baggage/luggage 4. work(工作) 5. homework 6.housework 7.furniture 8. poetry诗歌总称 9.air 10. water 11.hair 12.knowledge https://www.wendangku.net/doc/4915610329.html,rmation 14.money 15.news 16.progress 17.traffic 18.music 19.weather 20.permission 21.behavior Exercises:单句改错 (16.全国II) If we go on a trip abroad we can broaden our view and gain knowledges we cannot get from books. (16.四川) Mom has a full-time job but she has to do most of the houseworks. (15.全国I) The airs we breathe in is getting dirtier and dirtier

2018届高考英语二轮复习细节理解题专练一

( 细节理解题专练(一) A (2017·衡水中学全国高三大联考) Discovering the beauty of the science and math that shape our everyday lives, an experience in WonderLab will fuel your imagination and inspire you to see the world around you in new and exciting ways. Come and enjoy yourself! What to see Spread across seven different zones, there're loads of opportunities to get hands on with real scientific phenomena. Observe live experiments at our Chemistry Bar, see lightning strike before your eyes, play with forces on giant slides or travel through space under a canopy 苍穹) of stars. You can also take part in explosive science demonstrations led by our talented team of explainers. With 50 mindblowing wonders of science to enjoy, WonderLab is an experience unlike any other. Besides, a selection of shows will be performed daily in WonderLab's beautiful new show space. They are free of charge and last 20 minutes. Tickets ◆Day pass :£6 per person. This ticket gives you dayl ong access to WonderLab, perfect whether you're planning a special trip to the Museum or simply passing through London and want to feed your curiosity. ◆Annual pass :£10 per person. For less than the price of two visits, give yourself a year packed full of wonder, curiosity and breathtaking experiences. Opening times Open seven days a week, 10:00 — 18:00 (last entry 17:15). WonderLab will be closed on December 24,25 and 26 and will be open as usual from December 27. During school holidays our opening hours are 10:00—19:00 (last entry 18: 15). Please note that in peak periods (from midday onwards) we are experiencing long queues due to the gallery's popularity. 体裁:应用文 题材:新闻广告 主题:科技展 【语篇导读】 文章介绍了 WonderLab 的活动、票价及时间安排等信息,吸引大家前去 参观游玩。 1.What can you do in WonderLab?

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