阐述了两种不同半径圆弧凸模代替椭圆弧凸模所产生的误差，并比较其大小，从而实现凸模断面的优化设。
The errors are discussed as a result of two kinds of different radius arcs replacing elliptical arc, thereby, realize optimal design for punching cross section.
这种沟通始于对担忧或关注的事物的阐述，接着进行咨询或评价，从而以更精确的方式处理这些所关注的事物。
The interaction begins with an elucidation of complaints or concerns, followed by inquiries or evaluation to address these concerns in increasingly precise ways.
结合工程设计实践经验，阐述聚丙烯装置烷基铝贮存单元所具有的独特性，从而达到优化布置和完善配管设计的目的。
According to engineering design and practical experience, the author presents the unique characteristics, optimized layout and excellent piping design of TEAL metering unit in polypropylene plant.
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