关于电流跟电压、电阻关系的正确说法是()
若3x1﹣4y1﹣2=0,3x2﹣4y2﹣2=0,则过A(x1,y1),B(x2,y2)两点的直线方程是( )
—No. But it has been 3 years since I last here.
甲
乙
进价(元/件)
20
30
售价(元/件)
29
40