单项选择题
A.low pressure area B.high pressure area C.area of calm air D.cold front overtaking a warm front
An instrument designed to maintain a continuous record ...
单项选择题An instrument designed to maintain a continuous record of atmospheric pressure is a(n)（）.
A.mercurial barometer B.aneroid barometer C.barograph D.thermograph
An atoll cloud forming over an island due to heating of...
单项选择题An atoll cloud forming over an island due to heating of the land during the daytime would be which type? （）
A.Cirrus B.Cumulus C.Stratus D.Nimbus
Advection fog is most commonly caused by（）.A.air being ...
单项选择题Advection fog is most commonly caused by（）.
A.air being warmed above the dew point B.saturation of cold air by rain C.a rapid cooling of the air near the surface of the Earth at night D.warm moist air being blown over a colder surface
