单项选择题
A.high relative humidity B.frequent showers and thunderstorms C.steep pressure gradients D.frequent calms
In the doldrums you can expect（）.A.steady，constant wind...
单项选择题In the doldrums you can expect（）.
A.steady，constant winds B.frequent rain showers and thunderstorms C.steep pressure gradients D.low relative humidity
In reading a weather map，closely spaced pressure gradie...
单项选择题In reading a weather map，closely spaced pressure gradient lines would indicate（）.
A.high winds B.high overcast clouds C.calm or light winds D.fog or steady rain
In North America the majority of the weather systems mo...
单项选择题In North America the majority of the weather systems move from（）.
A.north to south B.south to north C.east to west D.west to east
