The phytogeny of the athyriaceae and the phylogenetic relation among genera are confused since last half hcentury 半个世纪以来，关于该科的系统位置和属的划分一直模糊不清。
2.
The present dissertation mainly deals with morphology , phytogeny , geographic distribution , and taxonomy of the tribe of typhlocybini from china morphological terminology was adopted principally from zhang ( 1990 ) and dworakowska ( 1993 ) . the preparation and dissection of male genitalia was made according to the traditional methods and the characters were illustrated under the olympus pm - ioad microscope with a leize drawing tube . the external characters of adults were illustrated under nikon afx - ii steromicroscope with a leize drawing tube 形态学术语基本遵从张雅林( 1990 )和dworakowska ( 1993 )的有关定义；鉴定标本均为成虫针插标本，雄性标本的外生殖器均采用常规方法完成解剖，在olympustx820604体视显微镜下观察鉴定，在olympuspm - 10ad显微镜下绘图，外部形态特征图在nikonafx -体视显微镜下绘制。
3.
The main contents are as follows : firstly , this paper has analyzed and researched completely to different control system in the field of industrial control . reviewing the phytogeny of process control , this paper has presented background , character , performance , framework and direction of fieldbus control system and ethernet completely and discussed inevitability to intervention in the field of industrial control of the ethernet 具体的内容如下：对当今工业控制领域的各种控制系统进行了全面的分析和研究，回顾了过程控制的发展史，详细的介绍了现场总线控制系统的发展背景、特点、性能、体系结构和发展方向。
4.
The present dissertation mainly deals with the morphlogy , taxonomy , geographical distribution and phytogeny of empoascini from china . the history and present situation both in china and abroad , its morphology , geographical distribution , economial importance , material and methods are introduced and discussed 综述了小绿叶蝉族分类的历史沿革、国内、外研究概况、研究材料和方法、经济意义、分类特征、世界及中国属、种的地理分布，进行了中国小绿叶蝉系统分类。
