文档介绍：several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measuremen方案统计分析、经理查询。下面分别介绍各个子模块的功能。
1．根底数据库维护。该子模块的功能包括：根底数据库管理、员工权限与系统平安管理、过时的数据去除、数据备份与恢复管理等。该子模块对商品分类目录、生产商／供给商／客户目录、部门／员工目录进行了统一编码和科学分类，方便了数据的录入，减少了记忆和处理工作量，为商业应用奠定了坚实的根底。通过操作权限控制，用户只操作授予权限的功能模块和指定范围的数据文件与记录，实现了完美的平安控制。
2．POS系统。POS系统驻留在收款机上，提供柜台零售作业所必需的一切处理功能。该系统支持小票交易方式(键盘输入)、超市交易方式(条码扫描输入)、专柜交易方式(单价输入)、零批前台交款交易方式等多种销售方式。该系统还支持多币种和多付款(现金、支票、信用卡、购物卡、礼品券)方式。交班结算前，可对交易记录进行追加、取消和修改。可随时浏览交易作业记录，查询统计当班交款情况，进行交班结算。
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in iron angle code bit at measurement level points grid errors, specific method is from baseline to methyl vertical box center line distance for a,, to b vertical box distance for b, list can measured
several group number, then with b ± a, =c,c is is methyl b two vertical box between of accurate size. Per-2~3 measurement, such as proceeds of c values are equal and equal to the design value, then the vertical installation accurate. For example a, b, and c valueswhile on horizontal vertical errors for measurement, General in i