The work breakdown structure comprises several levels of decomposition of the total project. The lowest level ofdefinition is always the().
A.planning element
B.work package
C.subtask
D.working interface
A.IaaS
B.PaaS
C.TaaS
D.SaaS
A.编制立项申请书
B.项目论证
C.项目识别
D.投标
A.资源分解结构
B.请求的变更
C.项目进度网络图
D.资源日历
A.开标
B.询价
C.评标
D.投标