单项选择题

What kind of （）can be used for gas and chemical fires?

A.equipment
B.apparatus
C.extinguishers
D.machines

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单项选择题

Fires can be divided into different （）.

A.kind
B.kinds
C.types
D.B+C

单项选择题

We are loading dangerous cargo, no （）, please.

A.smoke
B.smoked
C.smoking
D.to smoke

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