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【单选题】
对于Pr数,下列说法哪个是错误的2A.
它是运动粘度与热扩散率的比值
B.
它是研究非稳态导热时最常用的重要准则
C.
对于层流流动，当Pr=1时，δ=δt；
D.
它反映了流体中动量扩散与热量扩散的相对程度
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举一反三
【单选题】The Democratic Party led by Andrew Jackson represented the interests of（）
A.
northern industrialists
B.
southern slave owners
C.
frontiersmen
D.
Both B and C
【简答题】There are stories about two U．S . presidents，Andrew Jackson and Martin Van Buren，which attempt to explain the American English term OK．We don’t know if either story is true，but they are both interesti...
【单选题】Which of the following is true about Andrew Jackson?
A.
He was the inventor of "OK"
B.
He was poor in writing and reading
C.
He was a household name in America
D.
He was the editor of the Boston Morning Post
【多选题】为减轻短路电流的危害,限制短路电流的数值,可采用_________。
A.
电路中串（并）联电容器；
B.
电路中串入电抗器；
C.
多台变压器、多条线路分列运行；
D.
多台变压器、多条线路并列运行。
【简答题】There are stories about two US Presidents，Andrew Jackson and Martin Van Buren，which attempt to explain the American English term OK. We don't know if either story is true，but they are both interesting...
【单选题】What did President Andrew Jackson accomplish in his presidency?
A.
Abolition of slavery
B.
New tariffs on European imports
C.
The purchase of Hawaii
D.
Removal of Indians from their land
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