做“测定金属的电阻率”实验时,除待测的金属丝、电流表、电压表

做“测定金属的电阻率”实验时,除待测的金属丝、电流表、电压表、滑动变阻器、开关和足够的导线外,还需要下列哪些实验器材(  )

A.螺旋测微器               B.游标卡尺

C.米尺                        D.直流电源

答案

ACD

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