The National Electric Code, in Article 690.5, requires that any PV array installed on the roof of a dwelling must incorporate a ground-fault protection device to reduce fire hazards.
《美国国家电气法规》第690.5条规定，安装于住宅楼顶的任何光伏阵列都必须配备接地故障保护器件，以减少火灾隐患。
Two imitating boards which installed on the bottom of two side of header can adjust to stubble height according to different ground condition.
割台两侧底部设置仿形板，可根据不同地面状况调整割茬。
The underground pipeline is usually installed by top pipe method for the constructions on ground with concentrated railway and highway.
地面建构筑物．在铁路、公路密集条件下．顶管法铺设地下管道为最常见的施工方法。
The work roll surface can be ground on-line by a non-driven cup type of on-line Roll Grinder(ORG) installed in a strip mill to maintain the appropriate roll shape.
它通过设置在带材轧机上的无驱动式杯形磨辊装置，对轧制中工作辊表面进行在线磨别，以保证轧辊保持良好的轨型。
The millstone installed on the ground. People should stoop to push it slowly.
磨盘安在地上，人推石磨时得弓腰缓行。
After leveling the ground, the ground beam is paved, and then the ground board is installed on the ground beam according to the sequence of driver and slaver.
地面清理平整后，铺设地梁，然后按照公母次序在地梁上安装好地面板。
After leveling the ground, the ground beam is paved, and then the ground board is installed on the ground beam according to the sequence of driver and slaver.
地面清理平整后，铺设地梁，然后按照公母次序在地梁上安装好地面板。
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