The meta-search engine adopts these existing search engines ' query ability regards them as an unity and brings users an uniform interface and feedback results .

元搜索引擎利用现有的独立搜索引擎的查询性能，将搜索引擎看成一个 整体，为用户提供一个统一的查询界面与 返回结果。

The methods of determination bipolar inputting control signal optic-electron coder feedback signal connecting with MCU dimension 's unity of inputting signal between feedback signal zero position orientation and logical drive are proposed and realized .

提出并实现了系统双极性输入控制信号采样、编码器反馈信号与单片机接口、输入信号与 反馈信号的量纲 统一化、零位定位、以及逻辑驱动等处理方法。