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區(qū)分一種導(dǎo)電材料的正反面,通過(guò)電阻,緊急求助! |
點(diǎn)評(píng)
請(qǐng)教,我之前看電路板上的電磁繼電器都會(huì)并連個(gè)續(xù)流二極管,后來(lái)看機(jī)器電箱里面的中間繼電器沒看到有加二極管的,何解呢?
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