锅炉装向空排汽门的目的,只是作为锅炉蒸汽压力高时排汽用的阀门。()
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录用人员数量评估主要从三方面进行,分别为录用比、()和招聘完成比。
When used to fight fire,carbon dioxide().
A. is effective if used promptly on an oil fire
B. has a greater cooling effect than water
C. is lighter than air
D. is harmless to cargo and crew