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| 平屋顶挡水立缘 | |||
| 水封 | |||
| 挡水; 阻水活栓; 逆流截门 | |||
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water check : 13 phrases in 6 subjects |
| Automobiles | 1 |
| Electric machinery | 1 |
| Mechanics | 1 |
| Refrigeration | 1 |
| Shipbuilding | 1 |
| Technology | 8 |
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