题目内容

多重耐药的鲍曼不动杆菌有何特点?

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下列不属于气相色谱法的优点是()。

My parents are not interested in modern music. They are()the times.

A. before
B. behind
C. after
D. low

The pressure range between the system cut in and cut out pressures in a refrigeration unit is known as()

A. opposing operational drag
B. pressure distribution
C. differential
D. system purge

使用乙炔气瓶时下列哪些行为不违反安全使用要求()

A. 不用尽瓶内乙炔,留有一定的余压
B. 卧放的气瓶直立后马上安装减压器就使用
C. 不安装回火防止器就使用

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