电路图的字母表示什么意思？ 各个电路板上的字母都代表什么意思？？？
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\u6269\u5c55\u8d44\u6599
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QF:断路器，YV:电磁阀，A:电流，V:电压，M:电动机，KM:接触器，FR:热继电器，KA:中间继电器，FU:熔断器
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