A.60<云底高<90 B.60≤云底高<90 C.60<云底高≤90
A.75% B.50% C.90%
A.開(kāi)始時(shí)間小時(shí)和分時(shí)間間隔,是間隔開(kāi)始和終止時(shí)間 B.終止時(shí)間小時(shí)和分