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单选题
The term PROLONGED BLAST refers to（）.
A
a blast of from five to seven seconds' duration
B
a blast of from five to six seconds' duration
C
a blast of from four to six seconds' duration
D
a blast of from six to seven seconds' duration
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单选题You are Master of a towing vessel engaged in towing three barges astern.The middle barge of the tow would be required to sound which of the following during restricted visibility （）.A
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考题
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
a blast of from four to six seconds' durationD
a blast of from six to seven seconds' duration
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Flare
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