求翻译：19. 防雷做法详见《建筑物防雷设施安装》99D501-1、《利用建筑物金属体做防雷及接地装置安装》03D501-3、《接地装置安装》03D501-4。是什么意思？

19. Lightning protection practices detailed in "Building Lightning Protection installation of facilities 99d501-1, the metal body of the building to do Installation of lightning protection and grounding" 03d501-3, "grounding device installation" 03d501-4.

19.mine practices detailed in the building of mine facilities installed D 99 501 - 1, the metal body of buildings to do mine and ground units to be installed on D 03 501 - 3, the ground unit is installed > D 03 501 - 4.

19. The anti-radar procedure for details sees "Building Anti-radar Facility Installment" 99D501-1, "Makes Anti-radar And Grounding Installment using Building Metal body" 03D501-3, "Grounding Installment" 03D501-4.

19. lightning protection practice, described in the 99D501-1 of building lightning protection installations, the use of building metal body done 03D501-3 the lightning protection and earthing device installed, the grounding device installation 03D501-4.

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