单项选择题

（）should ensure that adequate measures are taken to prevent alcohol and drugs from impairing the ability of watchkeeping personnel.

A.The quarantine officers
B.Administrations
C.The immigration officers
D.The customs officers

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You are about to cross a narrow channel when you see an approaching vessel that can only be navigated safely within the channel.You should（）.

A.cross the channel as you are the stand-on vessel
B.cross only if the vessel in the channel is approaching on your port side
C.not cross the channel if you might impede the other vessel
D.sound the danger signal

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Between April and November, squalls（）as Sumateras（）in Malacca Strait in the late afternoon or overnight and（）E to affect the W coast of Malaysia and Singapore Island.

A.known, developing, move
B.known, developed, move
C.known, develop, moving
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You are underway in thick fog.You have not determined if risk of collision exists.Which statement is true?（）

A.Your speed must be reduced to bare steerage ways
B.A look-out is not required if the radar is on
C.The radar should always be kept on a short-range scale
D.Fog signals are only required when a vessel is detected by radar