单项选择题

Water is used to put out （）.

A. oil fire
B. electrical fire
C. common fire
D. special fire

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单项选择题
Are all hoses and equipment ready（）?

A. for use
B. to use
C. in use
D. of use
单项选择题
The foam extinguisher should be used （）.

A. in the end
B. upside down
C. down side
D. on top
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