 |
| |||
| control ling manhole | |||
| hand hole | |||
| accessing opening | |||
| overhaul hatch | |||
| access door; access hole | |||
| manway; inspection hole | |||
| access port | |||
| control manhole; inlet manhole; maintenance manhole | |||
| access; access opening; manhole | |||
| |||
| access opening | |||
| |||
| access fitting; access opening | |||
| |||
| access opening | |||
| |||
| manhole | |||
| |||
| hand hole | |||
| |||
| access slot | |||
| |||
| service hole | |||
| 检修 孔: 13 phrases in 5 subjects |
| Automobiles | 1 |
| Electronics | 1 |
| Engineering geology | 1 |
| Hydroelectric power stations | 2 |
| Technology | 8 |
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