血痕确证试验的代表试验是:()
A、联苯胺试验
B、沉淀反应
C、血色原结晶试验
D、吸收试验
参考答案:C
— How _____ are they?
— 10 yuan.[ ]
A. many
B. much
C. about
H2As04-的共扼碱是HasO42-。