试题与答案

如图所示为一光滑竖直圆槽,AP、BP、CP为通过最低点P与水平面分别成30°、4

题型:不定项选择

题目:

如图所示为一光滑竖直圆槽,AP、BP、CP为通过最低点P与水平面分别成30°、45°、60°角的三个光滑斜面,与圆相交于A、B、C点。若一物体由静止分别从A、B、C滑至P点所需的时间为t1,t2,t3,则

[ ]

A.t1<t2<t3

B.t1>t2>t3

C.t1=t2=t3

D.t1=t2<t3

答案:

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参考答案:急性偏头痛、 丛集性头痛

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During college, I took a history class to fulfill a requirement.
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On the last day of the class we gathered our   42   and headed for the door. The shy, red-haired professor stepped directly in front of me,   43   I reached the door, and put his hand out. He said, “I want to thank you for making my classes so interesting,” as he shook my hand warmly and   44   for the first time. I was so   45  . To me, it had been a pleasant way to pass the time. I had no idea that all of my questions asked in class had any effect on him or the others at all.
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A. happily
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A. cleaning
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A. lecture 
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A. played 
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C. created 
D. bought 
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A. reminding
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A. special  
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A. relaxed
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A. though  
B. unless
C. when
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44.
A. regretted
B. smiled
C. cried
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A. worried
B. surprised
C. bored 
D. satisfied
46.
A. offer 
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