采用间接法EIA测定,判断本次实验正常的几项因素是:()
A.空白孔无色
B.阴.阳性对照满意
C.弱阳性质控品S/OD≥1
D.每板献血者阳性率<15%
参考答案:A, B, C
Alice fixed her eyes upon Bob, there was an expression __ that he could not understand.
A.in it
B.on them
C.in them
D.on it
结构功能论