单项选择题
Three SHORT BLASTS mean（）.
A.I am altering my course to starboard
B.I am altering my course to port
C.I am operating astern propulsion
D.I am operating ahead propulsion
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The winch is liable（）worn-out in this way.
A.getting
B.to get
C.to have got
D.for getting -
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The winch at Hatch No.3 is（）trouble.
A.at
B.in
C.on
D.over -
单项选择题
The term PROLONGED BLAST refers to（）.
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
