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问题 单项选择题

下列不属于机械性吞咽困难的是（）

A.咽喉结核

B.甲亢性肌病

C.食管癌

D.纵隔占位病变

E.主动脉瘤

答案

参考答案：B

选择题
Our game of basketball _____. We had been playing for about half an hour when it started to rain heavily.

A. has interrupted
B. had interrupted
C. was interrupted
D. had been interrupted
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单项选择题

励磁系统的功能是控制（）的磁场。

A.轮马达

B.发动机

C.励磁机

D.发电机
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