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问题 选择题
把表面光滑的铅块放在铁块上，经过几年后将它们分开，发现铅块中含有铁，而铁块中也含有铅，这种现象说明（　　）

A．分子之间存在空隙

B．分子在永不停息地运动

C．分子之间存在着相互作用力

D．分子的引力大于斥力

答案

答案：B

单项选择题

The parents of a child being discharged from the day surgery center after insertion of tympanostomy tubes ask the nurse. "What will happen to the tubes in my child's ears" Which of the following would be the nurse's best response

A．"The tubes usually dissolve on their own in about 1 year. "

B．"The tubes must remain permanently in place. "

C．"You'll probably see them fall out in about 6 months. "

D．"Call for an appointment to have them removed in about 6 months. "
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单项选择题

燃气锅炉操作人员在岗期间应穿（）工作服。

A、防静电

B、化纤

C、涤棉

D、晴沦
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