单项选择题
A.forest fires B.smoke from industrial areas C.dust or sand storms D.water droplets with the relative humidity more than 95%
In the Southern Hemisphere winds in a low pressure syst...
单项选择题In the Southern Hemisphere winds in a low pressure system rotate in a（）.
A.clockwise direction B.northeasterly direction C.northerly direction D.counterclockwise direction
In the relatively calm area near the hurricane center，t...
单项选择题In the relatively calm area near the hurricane center，the seas are（）.
A.moderate but easily navigated B.calm C.mountainous and confused D.mountainous but fairly regular as far as direction is concerned
In the Northern Hemisphere，when the wind at your locati...
单项选择题In the Northern Hemisphere，when the wind at your location is northerly，the low pressure center causing the wind is located to your（）.
A.NNW B.WSW C.ESE D.SSW
