板式盘管或螺旋管是由两片有对应凹槽的平板或凸、凹板对压成型的。
The plate type coiled pipe or spiral pipe is molded by two flat plates with corresponding grooves or a convex and a concave plates which are oppositely pressed.
下凹的面颊骨在她脸上形成两处凹陷。
用有限元方法，对双圆弧弧齿锥齿轮沿齿长方向齿根应力进行了计算。 通过应力计算结果的分析，得出了凸、凹两齿侧应力沿齿长的分布规律。
Through the calculation of the finite element method(FEM) models for double circular arc profile spiral bevel gear, the stress changing pattern along the length of the tooth is obtained.
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