单项选择题

On hearing the fire signal, the crew should proceed immediately to （）their assigned duties.

A. carry on
B. put out
C. carry out
D. take off

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单项选择题
Efficient fire-fighting drill demands the full （）of persons in all departments of the ship.

A.operate
B.operation
C.co-operate
D.co-operation
单项选择题
The signals that will be used for emergency should be clearly （）.

A. set out
B. set off
C. get off
D. cut off
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