4.5是______的9倍,4.5的9倍是______.
4.5÷9=0.5;
4.5×9=40.5.
即4.5是 0.5的9倍,4.5的9倍是 40.5.
故答案为:0.5,40.5.
能通过胎盘的抗体是______
A.IgM B.IgDC.IgE D.IgAE.IgG