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"單刀双擲".... seems heard this term in school time's Physics Lesson... (but still don't really understand) wakaka 
hk_allen 發表於 7-11-2011 22:12  即relay 唔通电時AB 接觸,C 點斷開,通电後AC 接觸,B 點斷開,可以做2 組通电 |
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