下列哪一项不属于群体性治安事件的处置机制（）
A、处置机构与领导机制
B、信息情报机制
C、教育训练机制
D、快速反应机制
参考答案：D
A disk scheduling mechanism in an operatingsystem causes the disk arm to sweepback and forth across the disk surface servicing all requests in its path. This is a
A．First Come First Serve
B．Shortest Seek Time First
C．Scan
D．None of the above
