An air mass is termed warm if ______.
A.it is above 70°F
B.the ground over which it moves is cooler than the air
C.it originated in a high pressure area
D.it originated in a low pressure area
正确答案：B
气团被称为暖式假如在其移动下方的地面比它冷
Anairmassistermedwarmif______Aitisabove70°FBthe
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