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【单选题】
固定铰支座的约束反力一般可用两个相互垂直的分力表示,该两分力 。A.
一定沿水平和垂直方向
B.
一定指向物体
C.
一定背离物体
D.
指向可任意假定。
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举一反三
【简答题】A．She got up later than usual. B．She took the wrong train. C．She forgot that she should work. D．The train was late.
【简答题】Galaxy saw a man and a woman who communicated with the sign language at the train station when she was on the way home one evening. She noticed that the woman asked the mon for the direction. He told ...
【简答题】Galaxy saw a man and a woman who communicated with the sign language at the train station when she was on the way home one evening. She noticed that the woman asked the man for the direction. He told ...
【单选题】听力原文：M: Is it better to take tile train to Beijing or go by plane? W: The train is a lot cheaper, but it takes at least twice as long. Q: What does the woman mean? (3)
A.
She could not afford to fly to Beijing.
B.
It is more convenient to take a plane.
C.
Taking a plane costs more but saves time.
D.
It is better to go to Beijing by train.
【简答题】A.She gets angry with delays of the train. B.She is willing to wait for the next train. C.She doesnt understand what the man says. D.She is happy to talk with the man.
【简答题】A. She got up later than usual. B. She took the wrong train. C. She forgot that she should work. D. The train was late.
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