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單項(xiàng)選擇題

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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單項(xiàng)選擇題

The winch is liable（）worn-out in this way.

A.getting
B.to get
C.to have got
D.for getting

單項(xiàng)選擇題

The winch at Hatch No.3 is（）trouble.

A.at
B.in
C.on
D.over