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 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

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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

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