单项选择题
A definite advantage of using water as a fire extinguishing agent is its characteristic of（）.
A.alternate expansion and contraction as water in a liquid state becomes a vapor
B.absorption of smoke and gases as water is converted from a liquid to a vapor
C.rapid contraction as water is converted from a liquid to a vapor
D.rapid expansion as water absorbs heat and changes to steam
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A.damage from crane operations
B.being used for wash down purposes
C.accidental diversion of flow to wrong location
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单项选择题
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