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

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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
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A.use more right rudder
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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