A.at
B.in
C.on
D.over
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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
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
最新試題
Should the vessel have no deratisation certificate at the time of her delivery，she（）be held to be unseaworthy.
Smoking in bed on a ship is prohibited（）.
The term PROLONGED BLAST refers to（）.
In the International Code of signals，a group of three letters indicates（）.
Which mooring line has the least elasticity?（）
In order to prevent galvanic corrosion，an aluminum boat must be insulated from the davits and gripes. Which of the following is acceptable as an insulator?（）
Where would you find the call sign or call letters of the radio station on your ship?（）
The ship is now down（）head.
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 method is used to detect rot in manila lines?（）