搜题请搜索小程序“爱下问搜题”
问题 单项选择题

在图4-120所示机构的D点上作用水平力P，图中AC=BC=EC=FC=DE=DF=L，为保持机构平衡，在滑块A处所作用的铅直力Q的大小是（）。

A.A

B.B

C.C

D.D

答案

参考答案：D

填空题

比一比，再写词语。  

谙(          )        桐(          )        堪(          )        嘲(          )

暗(          )        铜(          )        湛(          )        潮(          )

捕(          )        幼(          )        遵(          )        驰(          )

哺(          )        幻(          )        尊(          )        池(          )
查看答案
单项选择题

Which of the following statements best expresses the main idea of the passage?

A.One’s physical appearance can influence our first impression.

B.Our first impression is influenced by the sensitivity of our brain.

C.Stereotypical impressions can be dead wrong.

D.We should adopt mature thinking when getting to know people.
查看答案