... hard feed water ==> 硬给水 hard feeder ==> 难肥家畜 hard ferrite ==> 硬磁铁氧体 ...
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hard chromium plated tool feeder 难长家畜
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Since with common calculation method, the calculated value of feeder shaping roller of ultra-accuracy grinder is approximate, it is hard to estimate its calculation error.
超精加工机床辊子装置的计算都具有近似性，很难估算计算误差，讨论了无心超精加工机床加工外凸滚子成形时机床辊子的解析解。
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