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【简答题】
构成 PCB 图的基本元素有:元件封装、( )、( )和阻焊膜、层、焊盘和过孔、丝印层及文字标记。
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【简答题】A boy was born to a couple after eleven years of marriage. They were a loving couple and loved the boy very much. When the boy was around two years old, one morning the husband saw a medicine bottle o...
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