目前认为有关肺气肿的发生机制，下述哪个不正确A．α1抗胰蛋白酶_爱下问搜题

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问题单项选择题

目前认为有关肺气肿的发生机制，下述哪个不正确

A．α1抗胰蛋白酶缺乏

B．弹性蛋白酶活性受抑制

C．中性粒细胞和单核细胞释放多量弹性蛋白酶

D．阻塞性通气障碍

答案

参考答案：B

选择题

—Why didn't you answer when I spoke to you in the street this morning?

—I ______ but you didn't hear me.[ ]

A. did answer

B. didn't answer

C. could answer

D. couldn't answer

单项选择题

某药物在胃中易被破坏，而且对胃有刺激作用，需包什么衣

A．糖衣

B．薄膜衣

C．肠溶衣

D．不包衣

E．缓释衣