单项选择题
There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．
A.straits
B.channels
C.canals
D.roadsteads
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相关考题
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单项选择题
The transfer procedures for oil products are required to be posted （）.
A.in the pilothouse
B.in the officer's lounge
C.in the upper pumproom flat
D.where they can be easily seen or readily available -
单项选择题
The step of a pilot ladder which prevents the ladder from twisting is the （）.
A.Proof bar
B.Shifting bar
C.Long bar
D.Spreader -
单项选择题
THE SPEED OF A VESSEL ADJUSTED TO THAT OF A PILOT BOAT AT WHICH THE PILOT CAN SAFELY EMBARK is （）.
A.Ground speed
B.Boarding speed
C.Relative speed
D.Speed of the vessel
