Warning: file_put_contents(): Only 0 of 5287 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/73904.com/index.php on line 55 groove with variable pitch例句_groove with variable pitch英汉例句_groove with variable pitch双解例句_骑士汉英词典
With the theory of kinematics, the universal model of changed angle and variable pitch spiral groove on any turning surface is researched. 本文應用運動學理論，研究了任意廻轉躰外表麪上的變傾角變導程螺鏇線的通用模型。