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【多选题】
下列关于流体粘性的说法中，正确的有（ ）A.
黏性是流体的固有属性
B.
黏性是运动流体抵抗剪切变形的能力
C.
流体黏性具有传递运动和阻碍运动的双重性
D.
液体的黏性随着温度的升高而减小
E.
气体的黏性随着温度的升高而增大
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【单选题】One of the biggest problems in food production has always been that people have no reliable access to exact information, ____________ is often the case in China.
A.
that
B.
what
C.
which
D.
it
【单选题】It has always been a problem to decide whether 'popular music' is music which represents the people or is simply music that the people like. The same problem of【C1】______exists with jazz. So many diff...
A.
definition
B.
classification
C.
imitation
D.
discussion
【单选题】What has always been the basis of business?
A.
Language
B.
Culture
C.
Business
D.
Society
【简答题】What has each generation of Americans always been struggling for?
【单选题】She has always _____ her father and felt highly honored for what he has been doing. [ ]
A.
looked up to
B.
looked down upon
C.
looked around for
D.
looked forward to
【简答题】What has the author’s belief about changes always been?
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