单项选择题
（） fire doors, windows, hatches, accesses and ventilators.
A.Closed
B.Close
C.Closing
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Inform the bridge and give the alarm at once （）the fire.
A. in case
B. case of
C. in case of
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A.periodically
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All the crew must know the locations as well as the （）of the life-saving and fire-fighting appliances.
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