蛋白质的电泳迁移率与下述因素中有关的是()
A.所带的净电荷
B.重量
C.颗粒直径
D.质/荷比
E.形状的不同
参考答案:A, B, D, E
砌筑240砖墙需留设斜槎时,斜槎留设规格正确的是( )。
A.高1.0m,长0.7m
B.高1.0m,长0.5m
C.高500m,长120m
D.高500mm,长200mm
—Excuse me, are these ______ new shoes?
—No, they aren’t. ______ are black over there.
A.your; Mine
B.my; Your
C.her; Her
D.mine; Yours