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| 螺栓带垫圈的螺钉头; 具有垫圈状支承表面的头部 | |||
| washer head: 10 phrases in 5 subjects |
| Animal husbandry | 3 |
| Automobiles | 4 |
| Aviation | 1 |
| Construction | 1 |
| Oil / petroleum | 1 |
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