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

According to the characteristics of longan, a forced-air pre-cooling device of longan for test was designed. Based on 7/8 time of pre-cooling, the relationship between air velocity and pressure drop or voltage frequency was obtained in test, and furthermore, the relationship between air velocity and energy was studied. The results show that the pre-cooling fan works more slowly, but costs a long time with a lower level of energy cost. In reality, a less time consuming method was needed. The method is controlling the increase of the air velocity with the decreased temperature of longan, the relationship between them was described, and the test proves the conclusion is reasonable.