2.Which of the following parameters are affected by scheduling and allocating resources to multiple projects?
A:Resouse use and resource leveling
B: duration compression and simulation
C: activity lists and the WBS
D: schedule slippage and in-process inventory

3. You need to shorten the project completion date. Additional resources are not available and the project has low risk. when the dependencies are preferential. what is the best alternative?
A:cut resource from a task
B: Move resources from the preferential,what is the best alternative?
C:Remove tasks from the project
D:Make more tasks concurrent

以上三题的答案是C,D,D，请哪位大侠给解释一下，另外，the allowances in activity sequence（活动排序公差），in-process inventory（进行中存货），the dependencies are preferential（依赖关系是首选的）都是什么意思呀？

敬请指教，谢谢！