判断是否为链路故障，一般采用的是用万用表观察通讯数据信号是否与标准通信数据信号相符。（）
参考答案：错
东欧剧变和苏联解体对我们有哪些启示？
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—Did the actor live alone in his house?
—Yes. He has a wife and two children. But ______ of them live with him. [ ]
A. none
B. all
C. both
D. neither
