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This article detailedly expatiated upon the principles, contents and methods of cropland classification; it analyzed the necessity to combine the work of cropland classification with GIS technology, summarized the attributions of ARC/INFOand some other related softwares; it established the technologic route of cropland classification supported by GIS, by a case study in Liwu Town,Li County Hebei Province, this article expatiated the practicable mechanism of combining the function of ARC/INFO with the work of cropland classification, and put forward some new ideas and approaches of utilizing GIS: this paper put forward the idea of coding the polygons in the basic graphic database such as soil map and land use map according to their attributes, and put forward the detailed coding project; based on the code databases, it expatiated upon the detailed approaches to create single梖actor map and output the final classification map; it put forward the principles and the method of creating classification units in the environment of GIS, that is how to keep the lines of soil polygon, the border of districts and the important objects such as residential areas, banks of rivers and roads ,and how to overlap single梖actor soil map and land use map, and to delete some vector lines of the overlapped map appropriately; it detailed the methods of creating mathematic model of classification coefficients in the environment of computer, and used FOXPRO6.0 programs to realize the automation of calculating coefficients; it represented the method of plotting the final map by overlapping various coverages according to the code tables and lookup tables, the process of outputting the cropland classifying map was finished by program.

本文法对耕地等别划分的原则、内容及方法作了较详细的阐述，介绍了多系数综合修正法的耕地等别计算方法及其具体应用和AHP的确权方法；分析了耕地等别划分工作与地理信息系统技术相结合的必要性，简要介绍了地理信息系统软件ARC／INFO及其他相关软件的功能特点，制定了地理信息系统支持下耕地等别划分的技术路线，通过对河北省蠡县蠡吾镇的实证研究，重点阐述了ARC／INFO及相关数据库软件与耕地等别划分结合的有效机制及GIS应用的一些新思想、新方法：提山了对土壤图和土地利用现状图等基础图形数据库进行特征编码的思想和具体的编码方案，阐述了基于与图形库相链接的特征编码表，单因素图提取、成果图的输出的具体实现方法；提出了GIS环境下耕地单元划分的原则和方法，即在保留土壤因素图斑界线、行政界线和重要地物等的原则下，将土壤单因素图和土地利用现状图进行拓扑叠加，对叠加图中的矢量线进行适当的删除；阐述了在计算机环境下，耕地分等参数计算模型建立的方法，并用FOXPRO6.0语言程序实现了参数计算的自动化；阐述了根据图形库特征编码表和建立绘图符号查找表，按不同图层叠加绘制成果图的方法，该过程用命令程序实现耕地等别图的输出。

SELECT ColumnA, ColumnB FROM T GROUP BY ColumnA + ColumnB SELECT ColumnA + constant + ColumnB FROM T GROUP BY ColumnA + ColumnB.

GROUP BY 子句中的运算式可在 FROM 子句中包含资料表、衍生资料表或检视表的资料行。

Forms management is a complementary module, basically all the other modules are likely to use big its functions, it is primarily to achieve a custom form templates, forms, storage, printing and other functions.

表单管理是一个辅助性模块，基本上在其他所有模块都有可能用大它的功能，它主要是实现表单模板的定制，表单的存储，打印等功能。

Furthermore, a frequency distribution table can be developed to form a cumulative frequency distribution table which is then used to construct a cumulative frequency polygon or curve.

利用频数分布表亦可再制作出累积频数表，利用累积频数表便可制作累积频数多边形和累积频数曲线。

Main results obtained are as follows:(1) Morphological diversities among/within populations were discussed by analyzing characters such as apical bud, leaf, acorn and cupule.

主要结果如下：(1)表型多样性的研究结果：表型性状的方差分析表明蒙古栎种内表型性状在群体间和群体内差异都极显著(α=0.01)。

When a DDL or DML statement is on a table, a table lock is acquired.

当用户对表执行 DDL 或 DML 操作时，将获取一个此表的表级锁。

The corresponding tableau algorithm is also provided. The soundness and decidability of the tableau algorithm are proved. It is shown that the complexity of tableau algorithm is PSPACE-complete.

设计了ALCKR+的语法、语义以及表算法，给出了表算法的正确性以及可判定性证明，证明表算法的时间复杂度为PSPACE-complete。

The results support the reliability and validity of the Decidedness and Comfort scales and the seven subscales of the Reasons scale.

男女大学生仅在原因量表的「抉择时机」分量表上呈显著差异。社会组与自然组学生在各量表上无显著差异。

Silly mistakes like these should not have happened, even though one may have a dive computer, imagine what will happen if the computer suddenly goes off at that moment, one will be left with nothing to guide except the depth and Submersible Pressure Gauge, that doesn't really help if sufficient knowledge is not drilled i nto one head of such danger.

这样的愚蠢错误不应发生，即使拥有个人潜水电脑表。试想如果电脑表于此时突然失灵，将会发生什么事，其除了测深仪/深度表及气压表外，将无法依赖任何器具来引导出险境。如果脑袋里没有事前拥有充足的知识，将酿成无法弥补的大错。

Providing kinds of mechanical, electronic digital measuring instruments, such as caliper, micrometer, height gauge, depth gauge, dial indicator, Bore gauge, bevel protractor, magnetic stand, thread gauge, gauge block.

供应各种机械类、数显类量具。如卡尺、千分尺、高度尺、深度尺、指示表、内径量表、角度尺、磁性表座、罗纹规、量块等。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。