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单选题
The duration of a prolonged blast of the whistle is（）.
A
2 to 4 seconds
B
4 to 6 seconds
C
6 to 8 seconds
D
8 to 10 seconds
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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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more than 6 short blasts and 1 long blast on the whistle，and the same signal on the general alarmB
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单选题Which of the following represents the emergency signal for fire aboard ship?（）A
More than six short blasts and one long blast on the whistleB
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单选题You are approaching another vessel and will pass starboard to starboard without danger if no course changes are made.You should（）.A
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单选题The abandon ship signal sounded by the vessels whistle is （）.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
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displaying code letter Y (Yankee)B
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单选题In reduced visibility，you hear two prolonged blasts of a whistle. This signal is sounded by a （）.A
power-driven vessel dead in the waterB
sailing vessel on the port tackC
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vessel fishing with nets
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