I can't find my key. _____ it is at home. [ ]
A. May be
B. Maybe
C. Might
D. May
答案:B
琼脂免疫电泳常用于
A.RNA的分离和纯化B.糖的分离C.DNA的分离和纯化D.蛋白质的分离和鉴定E.免疫球蛋白鉴定
毒粉灭鼠用药量较大,其常用浓度为毒饵的()倍