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【单选题】
一平行板电容器充电后与电源断开，若用绝缘手柄将电容器两极板间距离拉大，则极板上的电压U、电场强度的大小E和电场能量W将发生如下变化A.
U 增大 ， E 增大 ， W 增大
B.
U 减小， E 减小， W 减小
C.
U 增大， E 不变 ， W 增大
D.
U 增大， E 增大， W 减小
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【单选题】1)Who is the first scientist discovered that yeast extracts could ferment sugar to alcohol?
A.
James Watson
B.
Francis Crick
C.
Christian Anfinsen
D.
Eduard Buchner
【简答题】Passage One Questions 46 to 50 are based on the following passage. “Sugar, alcohol and tobacco,” economist Adam Smith once wrote, “are commodities which are nowhere necessaries of life, which have bec...
【简答题】万能铣床在上刀或换刀时,主轴应处于停转并( )状态,以避免发生事故。所以铣床设有( )环节
【单选题】Passage One "Sugar, alcohol and tobacco," economist Adam Smith once wrote, "are commodities which are nowhere necessaries of life, which have become objects of almost universal consumption, and which ...
A.
They were profitable to manufacture.
B.
They were in ever-increasing demand.
C.
They were subject to taxation almost everywhere.
D.
They were no longer considered necessities of life.
【简答题】万能铣床在主轴上刀或换刀时,为避免发生事故,主轴应处于停转并( )状态,因此,主轴电动机设有( )环节
【简答题】Sugar is added to the wine during ____to increase the alcohol level.
【单选题】They failed to convert sugar into alcohol.
A.
polite
B.
transplant
C.
mix
D.
transform
【简答题】A．阿司匹林 B．扑热息痛 C．贝诺酯 D．丙磺舒 E．吡罗昔康 无抗炎抗风湿作用的为
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