只要根据工程学对组装、功能、及安全操作无碍,则由良好的加工惯例产生的毛刺、锐边和混杂物是可以接受的。BURRS-SHARP EDGES AND FOREIGN MATERIAL RESULTING FROM GOOD MANUFACTURING PRACTICES ARE ACCEPTABLE PROVIDING THEY ARE NOT DETRIMENTAL TO ASSEMBLY, FUNCTION, OR SAFE HANDLING AS DETERMINED BY PRODUCT ENGINEERING.可见"锐边"---sharp edges