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【简答题】
Dictation. Listen to to the following passage. Altogether the passage will be read to you four times, during the first reading, which will be done at a normal speed, listen and try to understand the meaning. For the second and third readings, the passage will be read sentence by sentence, or phrase by phrase, with intervals of 15 senconds. The last reading will be done at a normal speed again this time you should check your work.You will be given 2 minutes to check through your work once more. Please write the whole passage on the following sheet.
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【简答题】网络管理员要对路由器 Router1 进行配置,使其使用三次握手身份验证来连接到路由器 Router2 。请将下面的描述同所需的配置命令搭配起来。
【简答题】【习题2-28】为了增强放大电路的带负载能力,用射极输出器作为输出级,如图所示。 (1)画出放大电路的微变等效电路; (2)求放大电路的输入电阻 和输出电阻 ; (3)空载情况下的电压放大倍数 ; (4)接有负载 时的电压放大倍数 。
【单选题】带负反馈的共发射极放大器如图所示，晶体管的rbe= 2 kW，b = 100。电路的电压放大倍数、输入电阻和输出电阻是（ ）【图片】
A.
A u = - 0.49， R i = 20.3 k W ， R o = 10 k W
B.
A u = - 250， R i = 20.8 k W ， R o = 10 k W
C.
A u = - 0.49， R i = 2 k W ， R o = 5 k W
D.
A u = - 250， R i = 2 0.8 k W ， R o = 5 k W
【简答题】试述21-三体综合征的主要临床表现。
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