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

433h,。By using the DH5937 stress measurement system and sensor technology, the data of the bending moment and torque of the cutter shaft were simulated and measured, and a combined load spectrum of the bending torsion coupling of the cutter shaft was complied. Meanwhile, an estimated formula of the fatigue life of the cutter shaft bearing combined stresses was deduced by using Miner liner cumulative damage theory, and the fatigue life of the cutter shaft was estimated to be 443h longer than the designed life by using the load spectrum of bending torsion coupling.