单项选择题
Which of the following is not a form of precipitation?（）
A.rain
B.frost
C.sleet
D.snow
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单项选择题
Waves formed by the wind blowing far away are known as（）.
A.sea
B.current
C.tide
D.swell -
单项选择题
If the moisture content of the cargo sample is（）the Transportable Moisture Limit,then the cargo should be safe to load.
A.above
B.below
C.equal to
D.uncertain -
单项选择题
The amount and accuracy of the information provided on the different charts（）considerably.
A.varies
B.maintains
C.Shifts
D.assembles
