单项选择题
A.ahead and equal to the ship's speed B.astern and equal to the ship's speed C.ahead and equal to twice the ship's speed D.astern and equal to twice the ship's speed
Steam fog is most likely to occur on the Mississippi an...
单项选择题Steam fog is most likely to occur on the Mississippi and Ohio Rivers in（）.
A.spring，around late evening B.spring，around early evening C.fall，around early morning D.fall，around midday
Radiation fog（）.A.always forms over waterB.is formed by...
单项选择题Radiation fog（）.
A.always forms over water B.is formed by a temperature inversion C.is thinnest at the surface D.dissipates during the evening
On the pole side of the trade wind belt，there is an are...
单项选择题On the pole side of the trade wind belt，there is an area of high pressure with weak pressure gradients and light，variable winds. This area is called the（）.
A.prevailing westerlies B.geostrophic winds C.doldrums D.horse latitudes
