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 orthogonal experiment was conducted on a test bench to test the cutting velocity and power requirement of maize stalks supported at two ends. The outcome showed that the cutting mode had the maximal influence on cutting velocity and the number of stalks to be cut obviously affected the power of chopping. For the requirement of chopper designing and factual condition of cutting, the tests for various pieces of stalks to be cut were conducted. The changing trend of cutting velocity and power were analyzed. The results indicated that two pieces of maize stalk should be chopped at a velocity of 13 6 m/s with supporting at two ends.