The circular ground built-upgear hob, designed by combining the superiorities of products from different countries shows its advantages over the integral hob in volume production .
集中各国产品优点设计而成的新型圆磨法装配式滚刀在批量生产中，相对整体滚刀表现出卓越的性能。
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Several groups of thermal balance equations for a helicopter gear transmission system are builtup by thermal network method.