常见例句Keywords Friction;Wear;Frictionfactor;Carbon-carbon composite; 摩擦;磨損;摩擦系數;碳／碳複郃材料;High frictionfactor decreased;Hardness has been increased by ten percent; 摩擦系數 大大下降、硬度提高10%25左右； 返回 frictionfactor