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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A.at
B.for
C.in
D.on
A.on
B.by
C.in
D.for
A.stop down
B.speed down
C.slow down
D.down slow
A.SOS，ZZZ，XXX
B.SOS，UUU，SSS
C.SOS，XXX，TTT
D.SOS，TTT，UUU
A.final topping off is occurring
B.first starting to receive fuel
C.hoses are being blown down
D.hoses are disconnected and being capped
最新試題
Which mooring line is likely to undergo the most strain when docking a ship under normal conditions?（）
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Where would you find the call sign or call letters of the radio station on your ship?（）
Geographic range is the maximum distance at which a light may be seen under（）.
I would be very much（）if you could arrange for a radio technician to come on board as soon as possible for my radar repair.
Which statement is TRUE about nylon line?（）
Which mooring line has the least elasticity?（）
Smoking in bed on a ship is prohibited（）.
The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.
Which spoken emergency signal would you use to call a boat to come assist a man overboard?（）