32. 下列電路圖中,其 I1 網目之電流方程式應為何?(A) 7I1 – 4I2 – 3I3 = 22(B) 7I1 – 4I2 – 3I3 = 18(C) 7I1 – 4I2 – 3I3 = -20(D) 7I1 – 4I2 – 3I3 = 20