蜗杆传动的失效形式有轮齿折断、齿面点蚀、磨粒磨损与胶合,主要失效形式是胶合与磨粒磨损。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧