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 tool is used to open the strands of fiber lines when making an eye splice?（）
Good anchorage may be obtained anywhere in this water area，the bottom being generally mud and sand，vessel may have（）.
Geographic range is the maximum distance at which a light may be seen under（）.
The winch at Hatch No.3 is（）trouble.
Which mooring line has the least elasticity?（）
The winch is liable（）worn-out in this way.
I hope you don’t mind（）the radar for us in a short time.
Where would you find the call sign or call letters of the radio station on your ship?（）
Which may ignite fuel vapors?（）
Keep clear（）the buoy.