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【简答题】
差放电下图所示，电路对称，β 1 =β 2 =50，R w =100Ω，它是调零电位器，当输入为零时，若输出不为零，可通过调整R w 上的电刷位置使输出u o =0。本题设电刷在R w 的中点上，其他参数都标示在图上，试解答下列问题： (1)求三极管的静态工作点； (2)双出的差模电压放大倍数 。若u i1 =1mV，u i2 =-0.4mV，则输出电压u o 为何值？ (3)若采用输出，R L 接在T 1 管的集电极，试求差模放大倍数 ，共模放大倍数 和共模抑制比K CMR 。若u i1 =1mV，u i2 =-0.4mV，则这时输出电压u o 为何值？
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【单选题】What will the man probably do next?
A.
Persuade the woman to be a policewoman
B.
Find a suitable job for the woman
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Help the woman to be a tour guide
D.
Provide the woman with some formal education
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【单选题】If a tourist desires to buy goods that is out of stock, and asks the guide to buy and arrange the shipment, what should not the guide do?
A.
Generally speaking, the guide should accept the request immediately.
B.
The guide should report to the travel service for permission and follow the directions of the travel service.
C.
Let the tourist leave enough cash with the guide. The travel service will refund the balance.
D.
The guide mails the receipt, consignment form and consignment receipt to the client upon approval of the travel service. The travel service keeps the copies of these documents for check.
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A.
Prepare a digital camera.
B.
Rent a pair of binoculars.
C.
Learn some European art and history.
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Find an English-speaking guide.
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