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单选题
Production of mechanical foam by a portable in-line foam proportioner（）.
A
increases the size of foam bubbles formed
B
increases the rate of foam production
C
improves the extinguishing properties of foam
D
gives the nozzleman more freedom of movement，since it can be placed anywhere in the hose line
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94 times greaterC
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Foam should not be used on electrical firesB
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考题
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