Two other cables from the receiving equipment drop in trunking in the central service duct of the tower block and then continue underground in 25 mm polythene conduit.
另外两个电缆从在大楼中央服务管中继接收设备，然后继续下跌地下25毫米聚乙烯管道。
Hydraulic control adopt insert type compact valve system, with reliable operation, long service life, minimized hydraulic shock, minimized duct connection and possible leak point.
液压控制采用插装阀集成系统，动作可靠，使用寿命长，液压冲击小，减少了连结管路与泄漏点。
For in-service structure it is difficult to con duct destructive test since its original finger print is hard to obtain.
在役结构因其原始指纹不易获得，使得对其进行损伤检测存在一定的困难。
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