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【单选题】
对一般翼型来说，下列说法中．哪个是正确的
A.
当迎角为零时，升力不为零
B.
当翼剖面有一个正迎角时，上翼面处的流线比下翼面处的流线疏。
C.
C.当翼剖面有一个正迎角时，上翼面处的流速小于下翼面处的流速。
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γsat>γd>γ>γ′
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