单项选择题

A vessel travelling down a narrow channel，especially if the draft is nearly equal to the depth of the water，may set off the nearer side. This effect is known as（）.

A.smelling the bottom
B.squatting
C.bank suction
D.bank cushion

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单项选择题

A vessel towing astern in an operation which severely restricts the towing vessel and her tow in their ability to change course shall，when making way，exhibit（）.

A.the masthead lights for a towing vessel
B.the lights for a vessel restricted in its ability to maneuver
C.sidelights，sternlight and towing light
D.All of the above

单项选择题

A vessel is equipped with a single right-handed screw. With rudder amidships and calm wind，the vessel will most likely back（）.

A.straight astern
B.to port
C.to starboard
D.in no particular direction

单项选择题

A vessel is considered to be restricted in her ability to maneuver under the Rules if she is （）.

A.at anchor
B.mine-clearing
C.engaged in fishing
D.engaged in towing