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單項(xiàng)選擇題

A pilot vessel may continue to sound an identity signal if she is （）.

A.aground
B.at anchor
C.not under command
D.being towed

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單項(xiàng)選擇題

A pilot chart does NOT contain information about （）.

A.average wind conditions
B.tidal currents
C.magnetic variation
D.average limits of field ice

單項(xiàng)選擇題

A petroleum liquid has a flash point of 85°F. This is a grade （）.

A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid