trapezoid method

Methods The method of sewing up with trapezoid by three layers, make vagina outside 1/ 3 segments and vagina muscles tighten.

方法：采用梯形缝合法即对阴道后壁呈梯形样三层缝合使阴道下1/3段及阴道口肌肉紧缩的手术方式。

This paper introduces the correct calculating method of width dimension of top edge, front and rear angles of two side edges and thread profile angle with front angle for lathe tool of trapezoid threads. There are reference values for practical production.

介绍梯形螺纹车刀顶刃宽度尺寸、两侧刃的前后角以及带有前角时牙型角的正确计算方法，对实际生产有参考价值。

The traditional methods for computing critical water depth of open channel with trapezoid section ( h k) are trial and error method, graphic method, approximate solution method and iteration method, whose shortcomings are rough precision, large computation amount and complex resolving problem.

目前计算梯形断面明渠临界水深hk的常用方法有试算法、图解法、近似公式法和迭代法，它们存在计算精度不高、求解复杂等缺点。

Testing method for tear resistance of nonwovens: trapezoid method

非织造布梯形法撕破强力试验方法

The program for parts with trapezoid thread is simplified by this method.

采用此方法可以简化具有梯形螺纹结构零件的数控车削加工程序的编写.