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问题 单项选择题

关于骨盆底的分区，下列哪项不正确

A．肛区有肛管通过
B． * * 通过尿生殖区
C．分为尿生殖区与肛区
D． * * 通过尿生殖区
E．以上均不正确

答案

参考答案：E

选择题

My book was here a second ago but now it's missing. Someone ________ a joke on me.[ ]

A. must be playing

B. must play

C. can't have played

D. can't play
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填空题

能使澄清石灰水变浑浊的气体是______；能使带火星的木条复燃的气体是______；空气中含量最多的气体是______；密度最小的气体是______．
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