一物体在另一物体表面滑动时，所受摩擦力的大小（） A．只

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问题选择题

一物体在另一物体表面滑动时，所受摩擦力的大小（　　）

A．只与该物体的重力有关

B．只与物体间的压力有关

C．只与物体间接触面的粗糙程度有关

D．与物体间接触面的粗糙程度及压力都有关

答案

答案：D

听力题

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小题1:However, by the latter half of the14th century, English ________(come) into widespread use among all classes in England.

小题2:There’re nearly 400 different types of sharks, but only about 30 types are known _______(attack) human beings.

小题3:The next morning Mrs Brown found the poor man _________(lie) in the street, dead.

小题4:He is the only one of the students who_______(be) the winner of scholarship for 3 years.

小题5:When it comes to ________(bring) up children, some people say strict control produces well-behaved children.

单项选择题

刺激迷走神经可以纠正下述哪种心律失常（）

A.心房扑动

B.心房颤动

C.窦性心律不齐

D.阵发性室上性心动过速

E.阵发性室性心动过速