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【判断题】
根据牛顿内摩擦定律,当流体流动时,流体内部内摩擦力大小与该处的流速大小成正比A.
正确
B.
错误
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【简答题】Where and when was the first McDonald ' s built? It was built in ____1____,California in ____2_____.
【单选题】When was the first umbrella used for protecting people from rain invented by Samuel Fox of England ?
A.
In the 1700s.
B.
In the 1800s.
C.
In the 1900s.
【简答题】在迈克尔逊干涉实验中当观察屏上出现同心圆干涉条纹时，调节微调转轮使得经反射镜形成的两个虚光源靠近，此时同心圆环干涉条纹是 （填“冒出”或“缩进”）的。
【简答题】某机械厂生产的铸件合格率为 90% ,则其合格率的标准差为( )。
【单选题】When was AIDS first identified?
A.
In the 1960s.
B.
In the 1970s.
C.
In the 1980s.
D.
In the 1990s.
【单选题】When printing was invented in the 1500 s, the ___ Bible was the first complete work printed.
A.
Latin
B.
English
C.
Aramaic
D.
Hebrew
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