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地图符号系统的设计与实现的设计方案，设计并实现了一套地图符号系统，提出了线状符号的附属属性设置实现，并采用了程序符号的思想实现一些相对特殊的如沙丘、河流、沼泽等地图符号，成功地对国家标准系列地形图图式进行了设计，实现了各种比例尺下的地图符号的绘制，完成了在Visual C“ 平台上所研制的地图符号软件系统的设计与开发-map symbols System Design and Implementation of the design plan, design and implement a set of map symbols, symbols of linear attributes set up a subsidiary to achieve, and the procedures used symbols of achieving some relatively unique as sand dunes, rivers, marshes and other map symbols, the successful demarcation of the country prospective series topographic map-a design enables a variety of map scale symbol mapping, completed in Visual C "platform, as well as the map symbols software system design and development

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G.726.pdf――ADPCM的标准协议。-G.726.pdf--ADPCM standard protocol.

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PayPal支付平台的接口编程文档。PayPal是目前国际电子支付中最常用的平台，如果你开发电子商务网站需要解决国际支付问题，便可以使用该平台。本文档说明了如何将PayPal支付平台集成到你的电子商务网站中。-PayPal payment platform programming interface documentation. PayPal is an international electronic payment in the most commonly used platform for the development of e-commerce site if you need to address the issue of international payments, they can use the platform. This document explains how to integrate PayPal payment platform to your e-commerce site.

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运放选型 运算放大器的结构形式主要有三种：模块、混合电路和单片集成电路。对于设计工程师来说，不仅是要知道所用产品的型号，而且还应熟悉生产这些产品的工艺，从而能够从一类放大器中选出一种放大器做特定的应用。-Selection of operational amplifier OPAMP structure There are three main types: modules, hybrid circuits and monolithic integrated circuit. Design Engineer for example, not only to know the product you are using models, but also familiar with the production process of these products in order to be able to elect one Class A amplifier amplifier make specific applications.

EUROPEAN STANDARD EN 50221 Common Interface Specification for Conditional Access and other Digital Video Broadcasting Decoder Applications-EUROPEAN STANDARD EN 50221 Common Interfa ce Specification for Conditional Access and ot her Digital Video Broadcasting Decoder Applic ations