关于补体的理化特点，下列不正确的是() ["A．补体的性质不稳定","B．不受各种理化因素的影响","C．在0～10℃条件下活性只能保持3～4天","D．加热56℃30min灭活","E．标本保存应置于-20℃以下"]
补体活化的经典途径的主要激活物是() ["A．细菌脂多糖","B．酵母多糖","C．免疫复合物","D．肽聚糖","E．凝聚的IgA"]
防止铸件脆断，可采取哪些措施?
能够激活补体替代途径的免疫球蛋白是() ["A．IgG1","B．IgG2","C．IgG3","D．凝集的IgA","E．IgM"]
Raji细胞的表面标志的特点是() ["A．有C1q受体、C3d受体，无C3b受体","B．有C1q受体、C3d受体、C3b受体","C．无C1q受体、C3d受体，有C3b受体","D．无C1q受体、C3b受体，有C3d受体","E．有C1q受体，无C3b受体、C3d受体"]
避免铸件出现跑火的现象，应注意哪些问题?
