單項(xiàng)選擇題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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1.單項(xiàng)選擇題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

2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題The single letter G，sent by an icebreaker to an assisted vessel，means （）.

A.I require a pilot
B.Longitude follows
C.I am going ahead; follow me
D.Do not follow me

5.單項(xiàng)選擇題The radiotelephone required by the Vessel Bridge-to-Bridge Radiotelephone Act is for the exclusive use of （）.

A.the Master or person in charge of the vessel
B.a person designated by the Master
C.a person on board to pilot the vessel
D.All of the above