题目

关于安培力，下面说法正确的是A．安培力与通电电流成正比B．安培力与磁感应强度成正比C．安培力与通电导线长度成正比D．安培力与通电电流在磁场的方位有关 答案：D—I hear you have a home robot.—Yes, it’s amazing. It ________ do all my housework.A.mustB.shouldC.couldD.can