單項(xiàng)選擇題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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1.單項(xiàng)選擇題In the Northern hemisphere northerly winds may cause temperature().

A.falling
B.rising
C.constant
D.same

2.單項(xiàng)選擇題Which of the following is not a form of precipitation?()

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

3.單項(xiàng)選擇題Waves formed by the wind blowing far away are known as().

A.sea
B.current
C.tide
D.swell

5.單項(xiàng)選擇題The amount and accuracy of the information provided on the different charts()considerably.

A.varies
B.maintains
C.Shifts
D.assembles