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上讲内容回顾：（１）为什么想把直流漏电流从原规定的３μＡ改为≤８μＡ或１０μＡ？（２）挂机阻机≥３ｋΩ的规定为什么合理？（３）振铃灵敏度高低的利弊如何？目前国标中对此指标的规定与国际上大部分国家的要求不一致，为什么？（４）振铃是否越响越好？是否可以关掉铃声不用？为什么有的国家标准电话机仍要求用机械铃？
On the content review: (1) Why do you want to change the DC leakage current from the original 3μA to ≤ 8μA or 10μA? (2) Hanging resistance ≥ 3kΩ Why reasonable? (3) What are the pros and cons of ringing sensitivity? At present, the requirements of this indicator in the national standard are not consistent with the requirements of most countries in the world. Why? (4) Is ringing better and better? Can you turn off the ring without it? Why do some national standard telephones still require mechanical bell?