单项选择题
Pilotage in this country is（）.
A.Free of charge
B.Important
C.Required
D.Unnecessary
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相关考题
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单项选择题
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 -
单项选择题
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 -
单项选择题
If the ship is alongside the wharf，what kind of（）is used?
A.pilot ladder
B.rope ladder
C.rod ladder
D.accommodation ladder
