常用的纯化多糖的方法有（），（），（），（），凝胶过滤法，还有（）和（）适用于粘多糖的纯化。
课程标准
民主斗士变成专制魔王的原因是：（） ["权力使人腐败","伪民主斗士","文化传统","以上说法都正确"]
薪酬管理中，经济性薪酬主要有（） ["基本薪酬","绩效薪酬","奖金","津贴","福利"]
What are three values that must be the same within a sequence of packets for Netflow to consider them a network flow?（） ["source IP address","source MAC address","egress interface","ingress interface","destination IP address","IP next-ho"]
挂钩牵引力
