单项选择题
A.upper front aloft B.cyclone C.occluded front D.cold front
A sea breeze is a wind（）.A.that blows towards the sea a...
单项选择题A sea breeze is a wind（）.
A.that blows towards the sea at night B.that blows towards an island during the day C.caused by cold air descending a coastal incline D.caused by the distant approach of a hurricane
A line of clouds，sharp changes in wind direction，and sq...
单项选择题A line of clouds，sharp changes in wind direction，and squalls are most frequently associated with a(n)（）.
A.occluded front B.warm front C.cold front D.warm sector
A hygrometer is a device used for determining（）.A.the a...
单项选择题A hygrometer is a device used for determining（）.
A.the absolute temperature B.atmospheric pressure C.wind velocity D.relative humidity
