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【单选题】
下列关于无限空间气体淹没紊流射流的说法中，正确的是______。
A.
不同型式的喷嘴，紊流系数确定后，射流边界层的外边界线也就被确定，并且按照一定的扩散角向前作扩散运动
B.
气体射流中任意点上的压强小于周围气体的压强
C.
在射流主体段的不断混掺，各射流各断面上的动量不断增加，也就是单位时间通过射流各断面的流体总动量不断增加
D.
紊动射流横断面上流速分布规律是：轴心处速度最大，从轴心向边界层边缘速度逐渐减小至零。越靠近射流出口，各断面速度分布曲线的形状越扁平化
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