测得血糖20天室内质量控制数据,计算出其均值为5.0mmol/L,标准差为0.25mmol/L,其变异系数应为() ["1%","2%","3%","4%","5%"]
下述不属于引起电解质分析仪重复性不良的因素是() ["电极未活化","电极斜率低","电极漏夜","进样针堵塞","未进行系统校准"]
下列关于正常体温的描述哪项是正确的()。 ["腋窝体温一般为36.5~37℃","正常体温每日波动范围不超过0.5℃","一般下午体温较早晨稍低","一般肛门内体温比腋窝体温略低","剧烈运动或进餐后体温可略升高"]
小儿单纯肥胖症严重者可引起() ["肝糖元素积症","尿崩症","肥胖心肺综合征","柯兴氏综合征","肥胖生殖无能症"]
湿式电解质分析仪中为各种试剂流动提供动力的是() ["三通阀","蠕动泵","真空泵","吸样器","微机系统"]
简述效用的含义。