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【简答题】
在图所示的差动放大电路中，已知：U CC =12V，U EE =6V，R s =10kΩ，R B1 =1.2MΩ，R B2 =20kΩ，R=51Ω，R L 的阻值忽略不计，T 1 和T 2 的β 1 =β 2 =50。
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