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【单选题】
超声速气流在变截面管道中流动时____。A.
横截面积的变化引起的密度变化占了主导地位
B.
横截面积的变化引起的速度变化占了主导地位
C.
超声速气流的密度是常数
D.
超声速气流在变截面管道中的流动情况与低速时基本相同
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