7. 如圖【二十五】所示電路，若可忽略，假設矽電晶體之β＝100，且＝10V，RC＝1kΩ，若欲使=5V，則RB之值等於________kΩ。

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7. 如圖【二十五】所示電路，若

可忽略，假設矽電晶體之β＝100，且

＝10V，RC＝1kΩ，若欲使

=5V，則RB之值等於________kΩ。

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