IEF指的是（）
A.蛋白质等电聚焦电泳
B.聚丙烯酰胺凝胶电泳
C.醋酸纤维素薄膜电泳
D.脉冲场凝胶电泳
E.琼脂糖凝胶电泳
参考答案：A
---- does your sister surf the internet?
---- About once a week.[ ]
A. How long
B. How often
C. How many
D. How soon
下面选项正确的是 A) “128＞＞1”值为32 B) “128＞＞＞1”值为64 C) “128＞＞＞1”值为-32 D) “128＞＞＞1”值为-64
