In this paper, based on CPM method, a regulating and calculating method of pressure is given on a branch junction head in the mine ventilation network in accordance with graphic theory.
本文以关键线路法为基础，根据图论理论，给出一种支路节点压力通风网络调节计算方法。
With CPM, estimates of activity durations are based on historical data and are assumed to be the mean or average time that the activity has taken to perform in the past.
CPM的活动历时估算通常以历史数据为基础，并且采用以往项目活动历时的平均值。
Based on a unified framework, CPM service system breaks the isolation barriers among various messaging service systems, so it can provide an integrated messaging service experience.
CPM业务通过统一的架构打破了各种消息业务系统之间彼此孤立的壁垒，为用户提供了一种综合的消息业务体验。
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