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

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

单项选择题In ballasting to survival draft，while in transit，due to extreme wind and wave loads，thrusters or propulsion，if available，should be used to（）.

A.reduce windward mooring tensions
B.maintain vessel heading
C.maximize accelerations
D.increase speed of advance

单项选择题In a following sea，a wave has overtaken your vessel and thrown the stern to starboard. To continue along your original course，you should（）.

A.use more right rudder
B.use more left rudder
C.increase speed
D.decrease speed

单项选择题If you are the stand-on vessel in a crossing situation，you may take action to avoid collision by your maneuver alone. When may this action be taken?（）.

A.At any time you feel it is appropriate
B.Only when you have reached extremis
C.When you determine that your present course will cross ahead of the other vessel
D.When it becomes apparent to you that the give-way vessel is not taking appropriate action