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單項(xiàng)選擇題

（） fire doors, windows, hatches, accesses and ventilators.

A.Closed
B.Close
C.Closing

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

Fire and boat drills are carried out （）.

A.periodically
B.quarterly
C.monthly
D.yearly

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