单项选择题

Inform the bridge and give the alarm at once （）the fire.

A. in case
B. case of
C. in case of
D. in the case of

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单项选择题
Fire and boat drills are carried out （）.

A.periodically
B.quarterly
C.monthly
D.yearly
单项选择题
All the crew must know the locations as well as the （）of the life-saving and fire-fighting appliances.

A.operate
B.operating
C.operations
D.operated
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