如R—R间距为0.6s,则心率为() ["60次/min","75次/min","80次/min","100次/min","120次/min"]
对变压器检查的正常项目有哪些?
正常心电轴的范围是() ["0°~+60°","0°~+30°","—30°~+9°","+90°~+180°","+30°~+90°"]
变异型心绞痛的心电图表现是() ["缺血型ST段压低≥0.1mV","T波低平、双向或倒置","ST段下斜型下移≥0.05mV","ST段抬高并常伴有高耸T波","ST段缺血型下移和T波倒置"]
弹簧机构的检查项目有哪些?
电磁操动机构的巡视检查项目有哪些?