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【单选题】
一台拨号上网的计算机与拨号服务器物理上连通后，延迟1分钟左右后却自动挂断，问题的原因可能是______。
A.
计算机上没有安装Modem驱动程序
B.
计算机的Modem配置中的速度参数值过大
C.
计算机没有设置TCP/IP协议的IP地址
D.
PPP协议中输入的口令不正确
拍照语音搜题，微信中搜索"皮皮学"使用
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【简答题】（ 2006 年石家庄市）某同学想用电流表、电压表测量一段电阻丝 R 的电阻，他已连接了部分电路，如图 20 甲所示。请你接着完成下列步骤： (1) 用笔画线代替导线，将电路补画完整． (2) 当电压表示数为 2.4V 时，电流表的示数如图所示，这时电路中的电流是 A ，电阻丝的电阻为 Ω ．这位同学通过改变被测电阻两端的电压，共测得三组对应的电压值和电流值，最后算出电阻的平均值，这样做的目的是 ...
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