Warning: file_put_contents(): Only 0 of 6255 bytes written, possibly out of free disk space in /home/www/wwwroot/zidian/001308.com/index.php on line 55 coefficient of friction英英字典_coefficient of friction剑桥英语解释_coefficient of friction柯林斯英文解释_零食美味英文词典
1. N the force required to move two sliding surfaces over each other, divided by the force holding them together. It is reduced once the motion has started 摩擦系数[mechanical engineering]