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本文档内为简易计算器的电路及PCB板布线图，简单明了，有兴趣的同学可以自己设计制作！ ......
Colour sensor is an interesting project for hobbyists. The cir- cuit can sense eight colours, i.e. blue, green......
Dew (condensed moisture) ad- versely affects the normal per- formance of sensitive electronic devices. A low-c......
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