38. Which of the following expressions is a static electric field (A) =(2xy,-2yz,-y2)(B) =(2z,-2yz,-x2)(C) =(2x,-2yz,-y2) (D) =(yz,yz,yz)(E) =(2xy-3,2x2,0)
38. Which of the following expressions i..-阿摩線上測驗