stepmouth
... 猪肾虫 Stephanurus dentatus 阶梯齿 stepmouth 原野马 steppe horse ...
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阶梯形齿条 ladder rack
错齿式阶梯麻花钻 subland drill
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介绍了单阶梯尖环齿钻头的结构特点及碎岩特点。
This paper introduces the 'structure characteristics and rock fragment characteristics of single step drill head with point pick.
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