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单选题
A long blast to warn the vessels（）vicinity.
A
in
B
on
C
at
D
for
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单选题You are underway and approaching a bend in the channel where vessels approaching from the opposite direction cannot be seen．You should sound（）.A
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单选题The abandon ship signal sounded by the vessels whistle is （）.A
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单选题A sound signal of seven short blasts and one long blast given with the vessel’s sound system is（）.A
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单选题The term PROLONGED BLAST refers to（）.A
a blast of from five to seven seconds' durationB
a blast of from five to six seconds' durationC
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单选题The signal given to commence lowering the lifeboats is（）.A
3 short blasts of the ship's whistleB
1 short blast of the ship's whistleC
3 long blasts of the ship's whistleD
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Each shall alter her course to starboardC
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Each shall indicate such action by one short blast on the whistle
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