求翻译：防雷和接地系统：本工程工作接地、保护接地、防静电接地和防雷接地共用一个接地系统，接地电阻不大于1欧姆。埋地干线采用-40×4热镀锌扁铁，埋深0.7米，接地级极采用L50×50热镀锌角钢，长度2.5米，埋深0.7米。是什么意思？

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Mine and the ground system: the earth, to protect the Earth, anti-static grounding and lightning arrester shared one of the grounding system, and the earth is not the 1 ohm resistor. buried roads - 40 ×4 hot iron, and zinc-bian buried 0.7 meters deep, the ground level with a 50 X 50 L hot dip galvan

Anti-radar and earth system: This project working earthing, the protective earthing, guard against the static electricity earth and the anti-radar earth use in common an earth system, the earth resistance are not bigger than 1 ohm.Buries the skeleton line to use - 40×4 the pot galvanize flat iron, t

Lightning protection and grounding system: this engineering work anti-electrostatic grounding and grounding, protective grounding, lightning protection and grounding shares a grounding system, grounding resistance less than 1 ohm. Buried trunk -40x4 hot dip galvanized flat iron, buried deep and 0.7

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