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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Fires can be divided into different （）.
A.kind
B.kinds
C.types
D.B+C -
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We are loading dangerous cargo, no （）, please.
A.smoke
B.smoked
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单项选择题
If there is a fire on board, inform the bridge and give the （）at once.
A.sound
B.sounding
C.alarm
D.signal
