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| 11. | main shut-off valve |
| 总关闭阀 |
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| 12. | fresh water main |
| 总食水管 |
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| 13. | r extraction main |
| 抽气总管道 |
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| 14. | main anti-siphonage pipe |
| 总反虹吸管 |
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| 15. | main bonding conductor |
| 总接驳导体 |
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| 16. | main earthing busbar |
| 总接地总线 |
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| 17. | main service fuse |
| 总火线保险 |
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| 18. | city main water meter |
| 总供水管水表 |
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| 19. | telephone main frame |
| 电话总配线架 |
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| 20. | main incoming circuit-breaker |
| 总输入断路器 |
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