you like fish for lunch? [ ]
A. Do
B. Are
C. What
答案:A
分解因式:2x3-8x=______.
IgG在对流免疫电泳中四个亚型有不同的表现,下列说法正确的是()
A.IgG1和IgG2向阴极移动,IgG3和IgG4向阳极移动
B.IgG1和IgG3向阴极移动,IgG2和IgG4向阳极移动
C.IgG1和IgG2向阳极移动,IgG3和IgG4向阴极移动
D.IgG1和IgG3向阳极移动,IgG2和IgG4向阴极移动
E.IgG2和IgG3向阴极移动,IgG1和IgG4向阳极移动