题目内容
一般来说, 刀具材料的硬度越高，耐磨性越好。
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在基面内测量的角度是刃倾角。
在主切削平面内测量的角度是主偏角。
刃倾角的正负影响切屑的排出方向。当刃倾角为正时，切屑流向已加工表面。
Up to December 2013, among the over 800 World Heritage Sites listed by UNESCO, China has _______listed, only second to Italy. Among them, _______are cultural heritages, _______natural heritages, and_______dual heritages. These sites are the most essential part of China's valuable and rich tourism resources.
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