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

Aiming at the shortages of constraints solving in collaborative design, an interval narrowing algorithm based on constraint bintree was put forward, in which two processes were included, namely the forward interval expanding operation from bottom to root of constraint bintree and the backward interval shrinking operation from root to bottom of constraint bintree. Then a constraint solver has been developed to solve the public solution space of the multi-disciplinary constraints. Using this method can avoid introducing the internal variables and decomposing the constraints into solution functions, improve solving efficiency and easily implement symbol calculation automation.