A.getting
B.to get
C.to have got
D.for getting
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A.at
B.in
C.on
D.over
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
最新試題
The radiotelegraphy safety messages for condition indicating distress，urgency and safety，respectively，are（）.
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Which statement is TRUE with respect to the elasticity of nylon mooring lines?（）.
The winch is liable（）worn-out in this way.
The term PROLONGED BLAST refers to（）.
In battery charging rooms，ventilation should be provided（）.
Which method of adjusting mooring lines is MOST useful for leaving a boat free to rise and fall with the tide?（）
Which spoken emergency signal would you use to call a boat to come assist a man overboard?（）
Should the vessel have no deratisation certificate at the time of her delivery，she（）be held to be unseaworthy.