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
Which statement is TRUE with respect to the elasticity of nylon mooring lines?（）.
The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.
Which statement is TRUE about nylon line?（）
If passengers are on board when an abandon ship drill is carried out，they should（）.
Three SHORT BLASTS mean（）.
Which statement is TRUE concerning radiotelephones on board towing vessels?（）
The winch is liable（）worn-out in this way.
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?（）
Which measure should NOT be taken to reduce the pounding of a vessel in a head sea?（）
Which term describes a part of a natural fiber line?（）