微粒子化学发光免疫分析(MLIA)中，作用于发生底物三氧乙烷的标记物是()
A．HRP
B．ALP
C．PR3
D．三联吡啶钌
E．AMPPD
参考答案：B
采用分类法，首先应按（）等标准，将产品划分为若干类别。
A.产品性质、结构、工艺过程及耗用原材料
B.产品定额费用
C.产品售价
D.产品性质
Which of the following led to the growth of ice trade according to the passage().
A.The growth of the American population.
B.The expansion of cities.
C.The change of the diet of ordinary citizens.
D.The increasing need for food.
