Warning: file_put_contents(): Only 0 of 6442 bytes written, possibly out of free disk space in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 mean diameter of a ball是什么意思，mean diameter of a ball的翻译，mean diameter of a ball音标、读音、用法和例句_沉淀汉英词典
Self-aligning ball bearings of the mean diameter range are also available with seals (Figure 1.6) and a for-life grease fill. 平均直径变动的调心球承也可带密封（图1.6）和一个终身油脂填充。 blog.sina.com.cn