单项选择题

When the wave period and the apparent rolling period are the same（）.

A.synchronous rolling occurs
B.roll period decreases
C.roll period increases
D.roll amplitude is dampened

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In the Northern hemisphere northerly winds may cause temperature（）.

A.falling
B.rising
C.constant
D.same
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Which of the following is not a form of precipitation?（）

A.rain
B.frost
C.sleet
D.snow
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