题目

电流定义式：I=；欧姆定律R=；电阻定律R=；闭合欧姆定律 I=；电功定义式W=；焦耳定律 Q=． 答案：【1】qt【2】UI【3】ρLS【4】UR【5】UIt【6】I2RtThere are about three books in our school library.A.thousands B.thousand C.thousands of D.thousand of