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
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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 -
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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
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单项选择题
The term restricted visibility，when used in the Rules，refers to（）.
A.Situations when you can see vessels on radar that you cannot see visually
B.Visibility of less than half a mile
C.Any condition where visibility is restricted
D.Visibility where you cannot see shore
