The fuzzy optimization mathematical model is built with the optimization target of minimizing the volume of tooth corona of worm gear in luffing mechanism of tower crane 摘要以塔式起重机变幅机构中蜗轮齿冠体积最小为优化目标，建立了模糊优化设计的数学模型。
It shows many typical characters seen in the type species of the genus of sinornithosaurus , which discovered also from western liaoning . ngmc 00 - 12 - a can further be included in sinornithosaurus by the dentary bifurcated posteriorly , unserrated premaxillary teeth , u - shaped furcula , extremel y short manual phalanx iii - 2 in comparison with the length of phalanx iii - l , very large and developed obturator process of the ischium , partially arctometatarsalian metatarsal iii and so on 它具有许多中国鸟龙属sinornithosaurus所特有的特征，如：齿骨后部分叉、前颌骨齿齿冠前后缘均无小锯齿、叉骨u形、第指第2指节很短、坐骨封闭突极大且具有坐骨后背突、第?骨部分窄足型等，因而无疑应归入该属中。
