皮皮学，免费搜题
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【单选题】
X 线管具有很高的真空度,能够( )A.
防止吸收软X线
B.
提供良好的热隔离
C.
防止电子在碰撞中损失能量
D.
能够用来自整流
E.
能够用来全波整流
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皮皮学刷刷变学霸
举一反三
【多选题】Which of the following inventions are the inventions during the UK’ Industrial Revolution?
A.
Jenny Spinning Machine
B.
Steam Engine
C.
Phonograph
D.
Lithography
【单选题】Many of the inventions that made people ______ and have determined the direction of American industry were related to agriculture and food production.
A.
abundant
B.
affluent
C.
sufficient
D.
pleasant
【单选题】The number of the inventions of this year is much more than ______ of last year.
A.
the ones
B.
those
C.
that
D.
the inventions
【简答题】Americans fully realized what Edison’inventions meant when they__________．__________
【单选题】' By exchanging limited exclusive rights for ( ) of inventions and creative works, society and the patentee/copyright owner mutually benefit, and an incentive is created for inventors and authors to c...
A.
disclosure
B.
trademark
C.
shareholders
D.
recovery
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