The network plans are inherently uncertain, and only under certain conditions before taking a fixed value, in many cases, the estimated time for project activities is difficult.
网络方案自身具有不肯定性，只要在特定条件下才取某个定值，在许多状况下，估量项目活动时间是艰难的。
The network plans are inherently uncertain, and only under certain conditions before taking a fixed value, in many cases, the estimated time for project activities is difficult.
网络方案自身具有不肯定性，只要在特定条件下才取某个定值，在许多状况下，估量项目活动时间是艰难的。
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