An intelligent telephone system controlled by SCM chip STC89C54RD is introduced, whose functions includes "blacklist", "please don" t bother in fixed time "and fire alarm."

设计一种基于STC89C 54rd单片机控制的智能电话系统，该系统在普通电话机的基础上，增加了黑名单、定时请勿打扰以及火警报警等功能。

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An intelligent telephone system controlled by SCM chip STC89C54RD is introduced, whose functions includes' blacklist ', 'please don' t bother in fixed time 'and fire alarm.

设计一种基于STC89C 54rd单片机控制的智能电话系统，该系统在普通电话机的基础上，增加了黑名单、定时请勿打扰以及火警报警等功能。

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The second was in failing to warn the new owners, the Michaels, that the fire alarm system had been subjected to filtering while a previous fault was fixed.

BBC: Weston-super-Mare Grand Pier fire: Alarm firm negligent