单项选择题
A.Northwest B.Southeast C.Northeast D.Southwest
According to Buys Ballot’s law，when an observer in the ...
单项选择题According to Buys Ballot’s law，when an observer in the Northern Hemisphere experiences a northwest wind，the center of low pressure is located to the（）.
A.northeast B.west-southwest C.northwest D.south-southeast
A warm air mass is characterized by（）.A.stabilityB.inst...
单项选择题A warm air mass is characterized by（）.
A.stability B.instability C.gusty winds D.good visibility
A series of brief showers accompanied by strong，shiftin...
单项选择题A series of brief showers accompanied by strong，shifting winds may occur along or some distance ahead of a(n)（）.
A.upper front aloft B.cyclone C.occluded front D.cold front
