在比色分析中,若试剂有色,试液无色,应选用()作参比溶液。
A.试液
B.试剂
C.溶剂
D.蒸馏水
参考答案:B
I have many books ,but _____ deals with the problem.
A none of which B none of them C call of which D all of them
____________________是确定肾小球疾病病理分型和病变程度的必要手段,但必须与____________相结合。