An air mass is termed warm if（）.<br>A:it is above 70°F<br>B:the ground over which it moves is cooler than the air<br>C:it originated in a high pressure area<br>D:it originated in a low pressure area

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

出自：海船船员证

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