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一个无反馈的开环（直接）系统直接产生对于输入信号的输出响应。
An open-loop (direct) system operates without feedback and directly generates the output in response to an input signal.
目的探讨研制一种无创性生理信号检测系统。
Objective: To search a kind of noninvasive physiologic signal examining system.
在适当场景下，引入无源中继系统可以达到解决弱信号的目的，同时不影响网络质量。
In some suitable condition, passive relay system can solve the problem of weak signals coverage without effects the network quality.
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