微变层几乎与使用前没有什么变化。
The changeable layer has nearly no change before and after used.
针对火灾探测过程中的光电探测器输出的微弱信号设计了一个微变信号提取放大电路。
A new circuit has been designed and developed for picking up and amplifying the weak signals of a photoelectric detector in fire detecting system.
以电子管微变等效电路分析为基础，设计了一款以驱动高保真耳机为目的的耳机放大器。
Based on the analysis of vacuum tube slight variation equivalent circuit, a headphone amplifier is designed to drive high fidelity headphone.
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