In order for a vessel to be engaged in fishing she must be（）.

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

单项选择题If the towline parts，you should（）.

A.start towing by pushing ahead
B.abandon the towing vessel
C.retrieve the tow bridle
D.relieve strain on the retrieving line

单项选择题If the towing bridle legs are not of equal length（）.

A.excessive strain is placed on the shorter leg
B.the shorter leg may fail
C.the longer leg is slack
D.All of the above