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
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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
