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泡沫灭火器得工作原理是什么？

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多重耐药的鲍曼不动杆菌有何特点？

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