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【简答题】
为了使三极管能有效地起放大作用，要求三极管的发射区掺杂浓度______；基区宽度______；集电结结面积比发射结结面积______；其理由是什么?如果将三极管的集电极和发射极对调使用，能否起放大作用?
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举一反三
【单选题】Neither the prices nor the quality _______ .
A.
has changed
B.
have changed
C.
is changed
D.
are changed
【简答题】Neither the prices nor the quality __________(have)changed.
【简答题】Neither the quality nor the prices of the product _____________(have) changed.
【简答题】There is little snow this winter, _______?
【简答题】改错 只需要把错误的词写出,然后改成相应的正确的词。 Neither the quality nor the prices has changed.
【简答题】Neither the prices nor the quality______(specify)in the last contract.
【简答题】.判断对错并改正。 A good number of students speaks English quite well. The amount of today's sales are considerable. Quantities of food were on the table. I have no idea what her politics is . The singer and ...
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