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关注：1
2013-05-23 12:21
求翻译：When backfill to this elevation, lightning protection and earthing devices and welding是什么意思？ 待解决
 悬赏分：1
- 离问题结束还有
When backfill to this elevation, lightning protection and earthing devices and welding
问题补充： |
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2013-05-23 12:21:38
When backfill to this elevation, lightning protection and earthing devices and welding
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2013-05-23 12:23:18
Back when filling thus elevation mine grounding devices with this welding
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2013-05-23 12:24:58
When returns to the earth fill here elevation, anti-radar grounding and this welding
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2013-05-23 12:26:38
When backfill to this elevation, lightning protection and earthing devices and welding
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2013-05-23 12:28:18
When backfill to this elevation, lightning protection and earthing devices and welding
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