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piercer with three rolls (A derivation of the Mannesmann tube-process has been developed, using a piercer with three rolls, which has greater accuracy and concentricity. 曼内斯曼制管法的进一步发展,开始使用三辊穿孔机,它具有更高的加工精度和同心度。) | |||
three roll piercer | |||
three-roll piercer |
三辊穿孔机 : 3 phrases in 1 subject |
Metallurgy | 3 |