A. (2013徐州二模)如图所示,质量为m1的木块和质量为m2的长木板叠放在水平地面上.现对木块施加一水平向
A、对m1,根据牛顿运动定律有:F-μ1m1g=m1a,对m2,由于保持静止有:μ1m1g-Ff=0,Ff<μ2(m1+m2)专g,所以动摩擦因数的大小属从中无法比较.故A、B错误.
C、改变F的大小,只要木块在木板上滑动,则木块对木板的滑动摩擦力不变,则长木板仍然保持静止.故C错误.
D、若将F作用于长木板,当木块与木板恰好开始相对滑动时,对木块,μ1m1g=m1a,解得a=μ1g,对整体分析,有F-μ2(m1+m2)g=(m1+m2)a,解得F=(
μ | B. 2011-2012徐州市高三二模英语答案 第一部分: 听力(共两节,满分20分) 1—5 ABCAB 6—10 BCBBA 11—15CCBAB 16—20 CACBA 第二部分: 英语知识运用(共两节,满分35分) 第一节 单项填空(共15小题;每小题1分,满分15分) 21—25 BACDA 26—30 BDBCA 31—35 ACDBD 第二节 完形填空(共20小题;每小题1分,满分20分) 36—40 BADCB 41—45 ADCDB 46—50 ADCAB 51—55 CDBCA 第三部分:阅读理解(共15小题;每小题2分,满分30分) A篇 56—59 DABB B篇 60—62 DCB C篇 63—66 CDBA D篇 67—70 BCAD 第Ⅱ卷 (两部分,共35分) 第四部分 任务型阅读(共10小题;每小题1分,满分10分) 71. Break/Split/Divide 72. reaching 73. set 74. Tips/ Advice/ Suggestions 75. visualizing 76. Allocate 77. rather 78. Make 79. failing/failure 80. similar 第五部分 书面表达(共1小题;满分25分) One possible version: Many animals are in danger of dying out. As is clearly shown in the bar chart, the kinds of wild animals have decreased sharply in the past decades. With 30,000 wild animals reced on average each year, there were only 1.5 million left till 2010. There are several reasons accounting for this problem. Apart from the polluted environment and natural disasters, illegal killing is an important reason. Human beings are making attempts to hunt wild animals for fashion and a big profit, which can be seen vividly from the right picture. This has resulted in a sharp decrease in the number of animals. In my opinion, it is high time for us to take quick action to protect them. A national public campaign should be launched to give animals a good living environment. In addition, the government should pass some firm laws to forbid abuse killing. Only in this way can we live in harmony with wild animals. C. 江苏徐州高考二模考几天 既然是二模,那考试的所有模式都是按照高考的样子做的。 D. 江苏徐州二模280分是走单招还是高考好 根据自己平时的考试分数,预计一下自己参加高考时的考试成绩能够达到多少分,如果可以达到本科院校的录取分数线就不要参加单独招生。 如果能够报考本科,就不要选择单独招生。 E. (2014徐州二模)如图,正方形ABCD的边长为25,E为AB中点,MN=5,线段MN的两端在BC、CD上滑动,当CM=___ 如图,正方形ABCD的边长为2 |