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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：轴心处速度最套，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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【简答题】Art is considered by many people to be little more than a decorative means of giving pleasure. This is not always the case, however; at times, art may be seen to have a purely functional side as well....
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【单选题】Currently, why are many Americans careful about touching others?
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【单选题】Art is considered by many people to be little more than a decorative means of giving pleasure. This is not always the case, however at times, art may be seen to have a purely functional side as well. ...
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【单选题】Currently, why are many Americans careful about touching others?
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It can often be seen as aggressive or sexual.
B.
They don't want to spread germs and illness.
C.
It is only good to touch those you are related to.
D.
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【简答题】Art is considered by many people to be little more than a decorative means of giving pleasure. This is not always the case, however; at times, art may be seen to have a purely functional side as well....
查看完整题目与答案
【单选题】Currently, why are many Americans careful about touching others?
A.
It can often be seen as aggressive or sexual.
B.
They don't want to spread germs and illness.
C.
It is only good to touch those you are related to.
D.
It can often be seen as aggressive or sexual and is only good to touch those you are related to.
查看完整题目与答案