搜题请搜索小程序“爱下问搜题”
问题 不定项选择

一物体置于粗糙水平地面上，按图中所示不同的放法，在水平力F的作用下运动，设地面与物体各接触面的动摩擦因数相等，则木块受到的摩擦力的大小关系是

[ ]

A．Ff甲>Ff乙>Ff丙　　　

B．Ff乙>Ff甲>Ff丙

C．Ff丙>Ff乙>Ff甲

D．Ff甲＝Ff乙＝Ff丙

答案

答案：D

阅读理解

阅读下面的材料。然后根据材料内容回答问题。

Every year there is the Spring Festival in China. Usually it is in January or February. It's the most important festival in China. So before it comes, everyone has to prepare things. They buy beef, pork, chicken, fruit and many other things. And they often make a special kind of food called "dumpling". It means "come together" in Chinese. On the day before the festival, parents buy new clothes for their children and children also buy presents for their parents. On the festival eve, all the family members（成员）come back to their home. This is a happy moment. They sing, dance and play cards. When they enjoy the meal, they give each other the best wishes for the coming year. They all have a good time.

小题1:When is the Spring Festival in China?

小题2:What does "dumpling" mean?

小题3:What do parents usually buy for their children before the festival?

小题4:What do the family members usually do on the festival eve?

小题5:Is the Spring Festival very important in China?
查看答案
单项选择题

下列事件的四种假定发生顺序，请你选择其中最符合逻辑的一种排列顺序。（）

（1）荷盘减翠菊花黄，枫叶飘红梧干苍

（2）天将暮，雪乱舞，半飘梅花半飘柳絮

（3）风微尘软落红飘，沙岸好，草色上罗袍

（4）接天莲叶无穷碧，映日荷花别样红

（5）碧玉妆成一树高，万条垂下绿丝绦

A．5—3—4—1—2

B．1—2—3—5—4

C．2—1—4—3—5

D．2—1—3—4—5
查看答案