某市数字城市项目主要包括ABCDE等五项任务，且五项任务可同时开展。各项任务的预计建设时间以及人力投入如下表所示。以下安排中， （ ） 能较好地实现资源平衡，确保资源的有效利用。
- A.五项任务同时开工
- B.待B任务完工后，再依次开展ACDE四项任务
- C.同时开展ABD三项任务，待A任务完工后开展C任务D任务完工后开展E任务
- D.同时开展ABD三项任务，待A任务完工后开展E任务、D任务完工后开展C任务
正确答案及解析
正确答案
解析
项任务同时开工，总共需要168人，120天。待B任务完工后，再依次开展A、C、D、E四项任务，总共需要112人，193天。同时开展A、B、D三项任务，待A任务完工后开展C任务、D任务完工后开展E任务，总共需要112人，120天；此方案使用资源最少，历时最短，是正确答案。同时开展A、B、D三项任务，待A任务完工后开展E任务、D任务完工后开展C 任务，盥共需要118人，124天。
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