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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 1400

In 1948,three American scientists invented __________ transistor, which is __________ small electronic device to control an electric current.

A.the; a B.a; a
C.the; the D.a; the
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In1948,threeAmericanscientists