氧气瓶取瓶帽时，只能用手或扳手旋转，禁止用（）等敲击。 A.铜_爱下问搜题

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问题单项选择题

氧气瓶取瓶帽时，只能用手或扳手旋转，禁止用（）等敲击。

A.铜锤

B.铁锤

C.铝锤

答案

参考答案：B

选择题

____ children whose parents had died in the earthquake ____ sent to live with families in other cities.

A. A great number of; was
B. A great number of; were
C. The great number of; was
D. The great number of; were

单项选择题

与慢性阻塞性肺气肿密切相关的疾病有（）

A.支气管哮喘

B.慢性支气管炎

C.急性粟粒型肺结核

D.肺栓塞

E.支气管扩张