單項(xiàng)選擇題

Pilotage in this country is（）.

A.Free of charge
B.Important
C.Required
D.Unnecessary

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單項(xiàng)選擇題

Mariners should ensure correct（）of aids to navigation during twilight periods when some lighted aids to navigation are lit while others are not.

A.identification
B.distinction
C.discrimination
D.clearly seeing

單項(xiàng)選擇題

If the winch should fail while you are hauling in the anchor，what prevents the anchor cable from running out（）.

A.Chain stopper
B.Devil's claw
C.Hawse ratchet
D.Riding pawl