问题详情
心电图纸移动速度为500mm/s、定准电压为1mV相当于5mm时,横距、纵距1mm各代表
A.0.02s,0.2mVB.0.04s,0.1mVC.0.05mV,0.02sD.0.08s,0.2mVE.0.1mV,0.04s