A.starboard side to the wharfB.either side to the wharf……

单项选择题In twin-screw engine installations while going ahead，maneuvering qualities are most effective when the tops of the propeller blades both turn（）.

A.to starboard
B.outboard from the center
C.to port
D.inboard toward the center

单项选择题In towing，heaving lines are used for（）.

A.passing a tow bridle to the tug
B.passing a messenger line
C.heaving in the tow bridle
D.service lines with rocket line throwers

单项选择题In towing it is desirable for the tug and the vessel to ride wave crests simultaneously because（）.

A.shock loading on the tow line is reduce
B.towing speed is improved
C.the vessel is more visible from the tug
D.the catenary of the tow line is reduced

单项选择题In order to back a right-handed，single-screw vessel in a straight line，you will probably need to use（）.

A.very little rudder
B.some left rudder
C.some right rudder
D.full left rudder

单项选择题In order for a vessel to be engaged in fishing she must be（）.

A.underway
B.using gear which extends more than 50 meters outboard
C.using a seine of some type
D.using gear which restricts her maneuverability