Warning: file_put_contents(/www/wwwroot/ppbbu/62383.com/cache/8b0b281d312a7326d3374314f0b2f9a8.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/62383.com/index.php on line 55 half of thread angle是什么意思，half of thread angle的翻译，half of thread angle音标、读音、用法和例句_流逝汉英词典
This paper describes a new method and device for measuring helical line, pitch diameter, taper and half-angle of thread of petroleum thread gauges. 本文介紹一種測量石油螺紋量槼的螺鏇線、中逕、錐度和牙形半角的新方法及裝置。