骨盆底形态学特征正确的是A．外层为盆膈 B．中层为泌尿生殖膈 _爱下问搜题

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问题单项选择题

骨盆底形态学特征正确的是

A．外层为盆膈

B．中层为泌尿生殖膈

C．肛门外括约肌属盆膈范畴

D．球海绵体肌有松弛 * * 作用

E．肛提肌是组成骨盆底外层的肌肉

答案

参考答案：B

单项选择题 A1型题

大部分真核生物mRNA3＇-端具有的结构是（）

A.polyA

B.polyU

C.polyT

D.polyC

E.polyG

选择题

____________ many times, but he still couldn’t understand it.

A．Though he had been told

B．Having been told

C．Having told

D．He had been told