A. red line B. purple line C. blue line D. dashed blue line
A. nimbostratus B. stratus C. cirrocumulus D. cumulonimbu
A. conduction fog B. radiation fog C. frontal fog D. advection fog
A. subtropical high pressure belt B. intertropical convergence zone C. doldrum belt D. polar frontal zone
A. Thin，metal，air tight cell B. Curved tube containing alcohol Column of mercury supported by atmospheric pressure D. Expansion of mercury in a closed tube
A. dense fog and high humidity B. gusty winds，thunder，rain or hail，and lightning C. clear skies with the approach of a cold front D. a rapid drop in barometric pressure followed by darkne
A. high pressure system B. cold front C. warm front D. occluded front
A. cirrus B. cirrostratus C. altostratus D. cirrocumulu
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