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| piping and conduit | |||
| piping | |||
| pipeline | |||
| pipeline A line of pipe connected to valves and other control devices, for conducting fluids, gases, or finely divided solids | |||
| oil pipeline | |||
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| petroleum pipe line | |||
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| piping | |||
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pijpleiding : 17 短语, 10 学科 |
| 一般 | 1 |
| 农业 | 1 |
| 建造 | 1 |
| 机械工程 | 1 |
| 煤炭 | 3 |
| 环境 | 2 |
| 矿产品 | 1 |
| 经济 | 1 |
| 财政 | 1 |
| 运输 | 5 |