ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

The limiting wear tensibility rate greatly influences the operational performance of chains. It is an important measure to establish the assessment criterion to ensure the reliable operation of mechanical products. Based on the theories of statistics, an assessment method of chain wear-resistant reliability was proposed, which could easily adjust the sampling scheme according to the types of chain transmission, so as to satisfy the needs of assessing the reliability of different mechanical products. The research shows that by using the reliability based on operational life or limiting wear tensibility rate as assessment index, assessing cost is not changed, and more information on reliability is obtained.