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搜题
【单选题】
用20N的水平推力推动一个重40N 物体在水平面上匀速滑动,则物体与水平面间的滑动摩擦因数是A.
20
B.
40
C.
2
D.
0.5
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举一反三
【单选题】听力原文：W: Some of the younger students seemed quite aggressive in the meeting. M: Yes, they really took over when it came to the issues of voting fights. Q: What does the man say about the younger stude...
A.
They didn't have enough knowledge to discuss voting rights.
B.
They left the meeting when the subject of voting rights came up.
C.
They dominated the part of the meeting about voting rights.
D.
They were most agreeable on the subject of voting rights.