单项选择题
Vessels should maintain a sharp lookout，especially during December through March，when navigating the right whale’s only known calving grounds which lie off the coasts of（）.
A.Nova Scotia
B.Maine and Massachusetts
C.Georgia and NE Florida
D.California and Mexico
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Vessel engaged in the launching or recovery of aircraft is called（）．
A.A vessel restricted in her ability to maneuver
B.A vessel not under command
C.A vessel constrained by her draught
D.A vessel not under way -
单项选择题
Underway at night，a vessel displaying the lights shown is（）.
A.Engaged in fishing
B.Mine sweeping
C.A pilot boat
D.Under sail -
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Under what condition are you allowed to depart from the rules of the road（）.
A.To avoid immediate danger
B.When authorized by the rig superintendent
C.To comply with an operator's requirement
D.Under no conditions
