Divide electronic reference resources into various types such as database, electronic reference book, search engine, electronic journal from micro-angle and describe the types in detail.
从微观角度将电子参考源分为数据库、传统工具书的电子版、搜索引擎、电子期刊等类型，并对各类型电子参考源作详细论述。
High frequency Electronic Technology experiment book, very good high-frequency experimental data, can be used as high-frequency reference.
高频电子技术实验书，非常好的高频实验资料，可作为高频的参考资料。
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