Vessel engaged in the launching or recovery of aircraft is called（）．

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

单项选择题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

单项选择题Two vessels meeting in a “head-on” situation are directed by the Rules to（）.

A.alter course to starboard and pass port to port
B.alter course to port and pass starboard to starboard
C.decide on which side the passage will occur by matching whistle signals
D.slow to bare steerageway

单项选择题Two vessels are in an overtaking situation.Which of the lights on the overtaken vessel will the overtaking vessel see（）.

A.Two masthead lights
B.One masthead light and a sidelight
C.Both sidelights
D.Stern light only

单项选择题Two barges are being pushed ahead by a tugboat.Which statement is TRUE concerning lights on the barges（）.

A.Each vessel should show sidelights
B.Each vessel should show at least one white light
C.The barges should be lighted as separate units
D.The barges should be lighted as one vessel