Levy-Jewrling质控图中是以下列哪项来定值限的() ["室间质控","室内检测","变异系数","平均值","标准差"]
清洗蛋白质污染的试管最好选用()。 ["铬酸洗液","7.5mol\/L尿素洗液","0.2mol\/LEDTA-Na2<\/sub>洗液","合成洗涤液","自来水反复冲洗"]
集成电路有哪些封装形式?分别如何安装?
建筑安装工程人工费包括()。 ["A.工资 ","B.奖金 ","C.津贴 ","D.社会保险费 ","E.职工教育经费"]
应激性溃疡的首发症状为() ["出血","腹泻","呕吐","便秘","食欲缺乏"]
基尼系数