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| 小，人，手，探,观察孔 | |||
| 探孔; 筛眼; 注人口 | |||
| 注入口 | |||
| 手孔 | |||
| 手工掏槽; 检査孔 | |||
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handhole plate : 21 phrases in 3 subjects |
| Compressors | 4 |
| Rail transport | 1 |
| Technology | 16 |
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