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【单选题】
针对圆管内的流体流动，关于层流与湍流的区别，如下表述中正确的是（ ）A.剪应力沿径向分布的数学规律不同B.湍流时不存在由于分子热运动而造成的动量传递，而层流时存在C.同种流体在同样的速度梯度下，湍流剪应力大于层流D.湍流时流体所有的质点都在脉动，而层流时流体所有质点都不脉动A.
剪应力沿径向分布的数学规律不同
B.
湍流时不存在由于分子热运动而造成的动量传递，而层流时存在
C.
同种流体在同样的速度梯度下，湍流剪应力大于层流
D.
湍流时流体所有的质点都在脉动，而层流时流体所有质点都不脉动
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举一反三
【单选题】This reflects the priority being attached to economic over political activity, partly caused by a growing reluctance to enter a calling blighted by relentless publicity that all too often ends in dest...
A.
powerfulness
B.
unwillingness
C.
renaissance
D.
apologeticness
【简答题】完成第一课课后习题一,写在课本上 第十段中找出小伙伴们开船的一系列动词,并分析其效果,写在课本上,再拍照上传 背诵诗经两首
【单选题】He gave me a definite__________ that the publication of that environment report would cause a stir among the local inhabitants.
A.
assurance
B.
sanction
C.
formulation
D.
obligation
【单选题】Which of the following statements is TRUE according to the passage?
A.
White lies often cause embarrassment in social situations.
B.
It is important for women to have an adequate sense of self-worth.
C.
It takes a little time to get rid of your habit.
D.
Take exercise like running if you are free and keep it up.
【简答题】我国依法治国的客体主要是指（ ）。
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