比较多组度量衡单位不同的变异度的指标是（） ["A.变异系数 ","B.方差 ","C.组距 ","D.标准差 ","E.平均值"]
以下不属于加热设备的是（）。 ["煤气管系","余热锅炉","交换机","废气盘"]
OCV和RCV的关系常是（） ["A.OCV>RCV ","B.OCV ","C.OCV=RCV ","D.两者无关系 ","E.OCV=4RCV"]
一个质控结果超过±2s，请问是违反了哪一个规则（） ["12s","12.5s","13s","13.5s","10.05"]
医学上的参考值范围通常指占参考人群某指标所在值的范围。常用参考人群范围为（） ["A.68.27％ ","B.90％ ","C.95％ ","D.97％ ","E.99％"]
腧穴
