将各种通信设备组合成一个系统，以传递语音信号为主，兼有数据传递功能，以保持建筑物内外通信畅通，达到各类信号源提供的信号可以共享的目的的系统是( )。

单项选择题According to the description listed below, choose the right readers. * Read the methods section and anything else that helps them finding a solution; * Big knowledge gap; * Possibly readers from a different area, looking for a method that can be used in their area; * Looking for clear introduction with many references. A、 The field intelligence gatherer B、The competitor C、The solution seeker D、The young researcher

单项选择题《电气装置安装工程高压电器施工及验收规范》规定，六氟化硫断路器基础的中心距离及高度的误差不应大于( )。A.3 mmB.10 mmC.5 mmD.12 mm