下列哪一项不是喉痉挛的诱因()
A.应用去极化肌松药
B.喉部手术刺激
C.血液或分泌物刺激
D.缺氧
E.迷走亢进
参考答案:A
— Your mum is very kind.
— Yeah, My mum is pretty considerate, you know what _____, she always arranges everything around me. [ ]
A. she means
B. you mean
C. I mean
D. we mean
利用平板电容器电容量的变化原理制作的传声器称为( )。
A.电容传声器
B.电动传声器
C.压电传声器
D.半导体传声器