人类在胚胎期合成的Ig是() ["A．IgG","B．IgA","C．IgM","D．IgD","E．IgE"]
人IgG各亚类活化补体的能力依次是() ["A．IgG1＞IgG2＞IgG3","B．IgG2＞IgG3＞IgG1","C．IgG3＞IgG1＞IgG2","D．IgG3＞IgG2＞IgG1","E．IgG2＞IgG1＞IgG3"]
避免引起铸件砂眼的具体措施有哪些?
具有调理作用的主要Ig是() ["A．IgG，IgA","B．IgM，IgD","C．IgE，IgG","D．IgE，IgD","E．IgD，IgG"]
惟一能通过胎盘的Ig是() ["A．IgG","B．IgA","C．IgM","D．IgD","E．IgE"]
避免产生缩孔的措施有哪些?
