Under what condition are you allowed to depart from the rules of the road（）.

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

单项选择题The type of fog that occurs on clear nights with very light breezes and forms when the earth cools rapidly by radiation is known as（）.

A.Radiation fog
B.Frontal fog
C.Convection fog
D.Advection fog

单项选择题The two vessels underway may collide with（），if they don’t take immediate measures.

A.One to another
B.One the other
C.Each the other
D.Each other