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【单选题】
半导体中受主能级的位置位于A.
禁带
B.
价带
C.
导带
D.
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A.
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B.
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C.
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D.
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【单选题】A Dictionary of the English Language, _______. by Dr. Samuel Johnson, was the first real attempt at a systematic and interestingly written survey of English usage.
A.
constructed
B.
composed
C.
compiled
D.
collected
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