机体缺乏IgG易患() ["A．反复呼吸道感染","B．化脓性感染","C．革兰阴性细菌败血症","D．巨球蛋白血症","E．重链病"]
后牙缺失时选择就位道的三种方式是什么?
简述牙冠外形高点线和导线的区别和联系。
用氨水处理的豚鼠血清不含下列哪种成分() ["A．C1","B．C2","C．C3","D．C4","E．C5"]
有四个重链恒定区的Ig是() ["A．IgG和IgA","B．IgA和IgM","C．IgD和IgA","D．IgM和IgE","E．IgA和IgE"]
简述卡环对抗臂的作用是什么?
