单项选择题
As for turbine oil, contacting with water in the form of steam will be inevitable so good （） properties will be essential.
A.defrosting
B.de-oiling
C.demulsifying
D.dehumidifying
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A.overlap
B.crush
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The usual method of effectively applying foam on a fire is by （）.
A.spraying directly on the base of the fire
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C.to prevent
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