采用的拥塞管理技术有四种：FIFO、PQ、CQ、（）.
参考答案：WFQ
As Jack left his membership card at home, he wasn't allowed ________ into the sports club.[ ]
A. going
B. to go
C. go
D. gone
治安管理措施本身既有打击又有保护的双重作用。( )
