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一个星期以前,在野外活动中,我的857d忙乱中搭反了线,与电瓶正负极接反了!!!过了一会儿才发现,当时就想起这个帖子,浑身出汗,天啊,完蛋了!上天保佑,重新接线,一切正常。看来保护电路在起作用!准备以后在电路上串接一个二极管,防止再次反接!