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
Smoking in bed on a ship is prohibited（）.
Which term describes a part of a natural fiber line?（）
The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.
The term PROLONGED BLAST refers to（）.
Where would you find the call sign or call letters of the radio station on your ship?（）
The ship is now down（）head.
Which statement is TRUE with respect to the elasticity of nylon mooring lines?（）.
Geographic range is the maximum distance at which a light may be seen under（）.
Which tool is used to open the strands of fiber lines when making an eye splice?（）
In battery charging rooms，ventilation should be provided（）.