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阶梯式
| 钻头
| 阶梯式 | |
| gen. | notching |
| 钻头 | |
| gen. | drill |
| hydroel.st. | aiguille; drill bit |
| met. | drilling bit; straight bit |
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| notching | |||
| echelon; multistep; staged; step screen | |||
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阶梯式 : 198 phrases in 36 subjects |
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