第十四章 了解电路,第一节 电是什么,一,二,三,四,一,二,三,四,一,二,三,四,一,二,三,四,1,2,2,1,1,2,1,2,1,2,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,解析,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,1,2,3,4,5,6,答案,解析,1,2,3,4,5,6,答案,解析,
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