利用电子元器件设计电路 ，制作了基本控制演示仪 ，演示了最基本的温、磁、光、声控制现象 。
Using electronic components to design circuit, the basic control demonstration instrument is made, and the control phenomena of temperature, magnetism, light and voice are demonstrated.
利用电子元器件设计电路 ，制作了基本控制演示仪 ，演示了最基本的温、磁、光、声控制现象 。
Using electronic components to design circuit, the basic control demonstration instrument is made, and the control phenomena of temperature, magnetism, light and voice are demonstrated.
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