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【简答题】
二极管的正向电流是由( )载流子( )运动而形成的,反向电流是由( )载流子( )运动而形成的。
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举一反三
【单选题】The sentence “ He could not sleep for noise without and fever within ” in paragraph 4 means “ HE could not sleep because . ”
A.
it was noisy outside and he had a fever
B.
it was quiet inside the hotel and he had a fever
C.
the hotel was so noisy that he became very excited
【简答题】佝偻病主要与哪组物质缺乏有关（） |坏血病主要与哪种物质缺乏有关（）A. 铁B. 维生素AC. 锌D. 钙+维生素DE. 维生素C
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