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【单选题】
一木板可以沿着竖直的滑轨无摩擦的自由下落,其上挂有一个摆动的单摆(单摆的质量远远小于木板的质量)。某时刻木板开始自由下落,此时在单摆已离开平衡位置但并未到达可以摆动最高点,则此时摆球相对于板
A.
作匀速圆周运动
B.
其他三个结论均不对
C.
与木板固定时一样摆动
D.
作非匀速圆周运动
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参考答案:
举一反三
【简答题】On the night of May 9, 2011, the famous musician Gao Xiaosong ran his car into three other cars in Beijing, because he drank(饮酒) too much. Gao went to prison(监狱) for six months and paid some money for...
【简答题】Please translate 消毒
【简答题】Translate the following sentences. No one thought that this young man with the guitar would change popular culture. With his long hair and tight pants, he became a age idol. Reconnect with old fri...
【判断题】吸光系数越小.说明比色分析方法的灵敏度越高。( )
A.
正确
B.
错误
【简答题】Translate the following into Chinese, paying particular attention to the underlined parts. 1.No one though that this young man with the guitar would change popular culture. 2.With his long hair and ti...
【简答题】听下面5段对话。每段对话你将听一遍。 1. What did Lucy learn to play this summer? A. The guitar. B. The piano. C. The violin. 2. What does the man think of Professor Black? A. Boring. B. Wonderful. C. Interesting. 3. Wh...
【简答题】连词成句。 1. guitar/can/Sam/the/play (.) ____________________________________________ 2. the Yellow River/is/than/The Changjiang River/longer (.) ____________________________________________ 3. man/Who/th...
【简答题】Traffic lights are very important to us. I think everyone knows this. But how were they born? Do you know? Garrett A. Morgan was the father of traffic lights. He was an American. Morgan was born in 18...
【单选题】Man, this guitar ______has gone on for five minutes...will he ever stop?
A.
solo
B.
ethnic
C.
tissue
D.
ample
【判断题】创造或实现价值是沟通的一个目的。
A.
正确
B.
错误
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