6、要求较准确地测出其阻值,电压表应选________,电流表应选________,滑动变阻器应选________.(填序号)②实验中某同学的实物接线如图4所示,请指出该同学实物接线中的两处明显错误.图4错误a:________________________________________________________________________;错误b:________________________________________________________________________.答案 (1)0.703 (2)①A C E ②错误a:导线连接在滑动变阻器的滑