The first example shows how to force the optimizer to use a nonclustered index to retrieve rows from a table , and the second example forces a table scan by using an index of 0 优化器提示的两种方式。第一个示例说明如何强制优化器使用非聚集索引检索表中的行，第二个示例使用索引0强制执行表扫描。
As a result of this research , these specimens were classified into 113 species in 40 genus of 14 families . three families , russulaceae , cortinariaceae and boletaceae , stand out predominantly because of the number of respective species and output 为便于区分，每科含属数在2个或2今以上者及每属内包含种数在3个或3个以上者均附检索表。
On the other hand , some characters used by the previous authors for distinguishing the varieties are extremely variable both within and among populations , but they are important in studying the evolution of the complex 同时认识到一些性状(如总苞片宽度等)作为检索表特征是不可靠的。结合细胞学、细胞地理学研究成果，探讨了形态学性状演化趋势。
The functions of system include the display of classification information , the search of classification data , the background manage of database , and the identification of unknown species of termite based on the dichotomous key or multi - way search 本系统具有分类资料显示、分类资料检索、数据库的后台管理和基于二项式检索表的鉴定或多途径检索鉴定四个功能。
The acrocarpous group includes the mosses capsule growing from the apex of branch or stem . it is from hdwigiaceae to hylocomiaceae . with bigger body , this group can preserve water and soil in forest ecological system and be favored double by horticulturist 同时，根据研究的标本编制了河北省侧蒴藓类植物分科、分属、分种检索表，并根据标本对其中重要的代表种类做了显微绘图。
The establishment of classification database is to manage easily the classification information and to provide necessary data for multi - way search . the establishment of key databank is to provide necessary data and information for dichotomous key search 分类数据库的建立是为了使分类资料的管理更加方便，也为多途径检索提供必需的资料；检索表数据库的建立则是为二项式检索提供必需的数据、信息。
Moreover , a systematic arrangement on the genus in henan province and artificial key to the species have been made . characteristic description have been given to all the taxone and followed by the distribution and habitat . some taxone have also been discussed briefly 此外，还对河南槭属植物作出系统排列，编制出分类检索表，对各类群分别作了特征描述，记载了产地和分布，并对部分种作了简单的讨论。
Secondly , in the taxonomy part , 47 species of 12 genera in the tribe haplothripini from china have been identified and described , of which 17 species are new to science , 6 species are newly recorded from china . keys are given to all genera and species concerned 分类部分系统描述了中国简管蓟马族12属47种，包括17新种， 6中国新记录种，编制了分属、种检索表，绘制了所有种主要形态特征图，并补充了雄性外生殖器图。
The subsystem of identification could provide two ways of search for unknown species of termite . one was the dichotomous key , and . another was multi - way search . these two search way all could provide satisfying search results 白蚁鉴定子系统可从已知的分类阶元开始，基于二项式检索表进行鉴定，鉴定原理同传统的二项式检索；也可采用多途径检索方式，利用多个形态特征，对白蚁种类进行鉴定，鉴定结果显示被鉴定种的信息和用于鉴定的形态特征。
The first chinese isoptera classification information and key database were built by the lamp in this paper . this databank could provide us the termite classification information and let us identify the unknown species through two ways of dichotomous key or multi - way search 本系统以此作为开发和应用平台，第一次建立起了中国等翅目昆虫的分类信息和检索表数据库，实现了对分类资料的数据库化和基于二项式检索表的分类鉴定和已有种多途径检索。
