dummy activity meaning in Chinese

虚工序
虚工作
虚活动
虚拟动作
虚拟活动
虚拟作业
虚作业

( 3 ) with the conception of quantum probability and composite method of path in network , the earliest time of node merged with two or more paths is corrected , and then make a dummy activity which follows the node and which holds a duration time that the earliest time of the node added time after the paths are merged , and the subsequent work of the node follow the dummy activity
采用线路合成，引进当量概率概念，对pert网络中有二条以上汇入线路节点的最早时间进行修正，并将修正后增加的时间作为一新活动(工序)的持续时间，然后将该新活动作为原节点的紧后工序，而原节点的紧后工序作为该新工序的紧后工序。