为了使电力系统通信设备的呼叫装置更加使用方便工作可靠，我们研制了以按键电话机发出双音频呼叫信号进行选择接收的音频选号装置。
In order to improve the ringing method of telephone used in power systems, a type of selective calling device using audio frequency has been developed.
这些电话系统将电话机上的按键变成数据录入机构，用于完成标准化的电话送入数据库，如验证一个帐户的收支是否平衡。
These are phone systems where the keypad becomes the data-entry mechanism for performing standardized calls into a database, such as verifying the balance of an account.
这些电话系统将电话机上的按键变成数据录入机构，用于完成标准化的电话送入数据库，如验证一个帐户的收支是否平衡。
These are phone systems where the keypad becomes the data-entry mechanism for performing standardized calls into a database, such as verifying the balance of an account.
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