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ASTM标准磨口仪器
产品介绍：从下向上看，大口变小口。
产品型号：
| 上磨口 | 下磨口 | 单价 |
| 10/30 | 14/20 | 38 |
| 10/30 | 19/22 | 38 |
| 10/30 | 24/40 | 39 |
| 14/20 | 19/22 | 32 |
| 14/20 | 24/40 | 35 |
| 19/22 | 24/40 | 37 |
| 19/22 | 29/42 | 39 |
| 24/40 | 29/42 | 40 |
| 24/40 | 34/45 | 54 |
| 24/40 | 45/50 | 71 |
| 24/40 | 55/50 | 98 |
| 29/42 | 45/50 | 78 |
| 29/42 | 55/50 | 99 |