单项选择题

After having activated the emergency position indicating radio beacon，you should（）.

A.turn it off for 5 minutes every half-hour
B.turn it off and on at 5 minute intervals
C.turn it off during daylight hours
D.leave it on continuously

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After an explosion，repair of emergency machinery and services should be accomplished（）.

A.after control of fire，flooding，and structural repairs
B.immediately，before the emergency is under control
C.after control of fire，but before control of flooding
D.after stability is restored

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A vessel sailing from Liverpool to New York puts into Boston，Mass. for emergency repairs. If no inward foreign cargo is to be discharged at that port，which of the following documents is required?（）

A.Custom Manifest
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A vessel may enter a traffic separation zone（）.

A.in an emergency
B.to engage in fishing within the zone
C.to cross the traffic separation scheme
D.All of the above