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【单选题】We all admire the beautiful blue of a clear sky or the superb contrast between the brilliant white of the clouds and the skyblue between them. This colour, however, is not natural in the atmosphere; i...
A.
atmospheric impurities
B.
molecules of gas
C.
varied shades of color
D.
different times of the day
【单选题】航空器适航性是指：（）
A.
航空器适合空中航行并能保证飞行安全应具备的最低飞行品质特性
B.
航空器适合空中航行并能保证飞行安全应具备的最高飞行品质特性
C.
适合航空器空中航行并能保证飞行安全的最低气象标准
D.
适合航空器空中航行并能保证飞行安全的最高气象标准