We desire to continue to cooperate sincerely with new and old customers home and abroad in excellent product, normol management, aggressive service.

玖玖公司愿以精良的产品、规范的管理、积极的服务，与国内外新老客户真诚合作，共创未来。

We have also analysed the ratio between tangential forces and normol forces with respect to both chip formation forces and friction forces. The ratio generally falls within the range of 0.2~0.59.

从切屑变形力与摩擦力两方面分析了切向磨削力与法向磨削力的比值，大体上应在0.2～0.59范围内。