activity job活动作业activityn.活动；活跃vt.表演adj.厉害Activity - based Cost作业成本法activity of blood serum血清酶活性activity and inert rate活惰比activity classification业务活动分类Activity quantification活度定量activitymixing material活性混合材料activity network diagram活动网络图Activity of the engineer工程师积极性activity characteristics活动特征activity-node net work活动节点网络