基本解释[机械工程]球平均直径英汉例句双语例句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.cnmean diameter of a ball更多例句专业释义机械工程球平均直径