two-stage structure design
two-stage structure design
两级结构设计
以上为机器翻译结果，长、整句建议使用 人工翻译 。
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The fine spur gear with good size-precision and surface-roughness is obtained through two-stage hole-forming process scheme and reasonable die structure design.
选用两阶段成形工艺和合理的模具结构，制备出了具有良好尺寸精度和表面粗糙度的精密齿轮。
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