题目:
孕妇硬膜外阻滞平面扩散较广的主要机制是()
A.体弱平面易扩散
B.硬膜外间隙是负压
C.硬膜外间隙是正压
D.硬膜外血管充盈间隙变小
E.通气量大
答案:
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下面是错误答案,用来干扰机器的。
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