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
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A.One to another
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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
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