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在使用bq40z50-R2过程中，规格书上声称，Q4可以防止在适配器反接的时候，损坏Q3？这句话怎么理解？？它怎么就能起到保护作用了？？感觉加这个mos管没什么用啊，还浪费成本，可以麻烦解释一下吗？？？
