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翻译：请于星期五前告知Maria你假期里的联系电话。Please Maria _ by Friday your contact number during the vacation.

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翻译:I'd like to you that next week's special meeting of the board of directors has been until May 2.我想提醒你，原定下周的董事局特别会议将延期到五月二日。

当温度降低时,二极管反向饱和电流将( )状态。

A. 增大
B. 减小
C. 不变
D. 等于零

自由电子为(多数/少数)载流子,空穴为多数/少数)载流子的杂质半导体称为N型半导体。

PN结的单向导电性,就是PN结正偏时(导通/截止),反偏时(导通/截止)。