纯化抗原常用的葡聚糖法适用于()。 A.密度梯度离心 B.凝胶过滤 C.亲和层析 D 发布时间:2017-06-13 05:12 │ 来源:www.tikuol.com 题型:单项选择题 A1/A2型题 问题: 纯化抗原常用的葡聚糖法适用于()。A.密度梯度离心B.凝胶过滤C.亲和层析D.离子交换层析E.沉淀
题型:单项选择题 A1/A2型题 When I entered the room, I found a little boy _____ on his mother's knees _____ to draw a picture. [ ]A. seated; learning B. sitting; to learn C. seating; learning D. sat; was learning 查看答案
题型:单项选择题 A1/A2型题 ---What’s ______population of China?---China has_____ population of 1.3 billion.A.a; theB.the; aC./;/D.the; the 查看答案