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【单选题】
Why must ice, snow, and frost be removed before flight is attempted? .A.
small amounts of ice build-up can radically degrade the carefully optimized aerodynamic performance of wings and control surfaces.
B.
climb out performance can be seriously affected
C.
A and B
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【简答题】(矩阵的秩02)
【简答题】在PCM传输线上传输的码型是（），在交换设备内采用的码型是（）。
【简答题】在PCM传输线上传输的码型是（）码，在交换设备内采用的码型是（）码。
【单选题】If you want to be a creative writer, you have to form your own ______ of writing. [ ]
A.
manners
B.
style
C.
type
D.
ability
【简答题】阅读理解。 Do You Want To Be A Musician? Do you want to be a musici an? Come to our club, and you’ll be very happy in the club. We have lessons about the piano, the drum s, the bamboo flute, the guitar and...
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