求翻译：在计算出各个活动的最早开始和结束时间之后，就可以计算活动的自由时差，在计算前导图（PDM）的自由时差时应注意，由于引入了多种逻辑关系，并且活动间可以存在延时，所以其计算方法与箭线图（ADM）的计算方法不一样（Sprecher et.al.，1995）。是什么意思？

Calculate the free float of the activities of the various activities of the earliest after the start and end times can be calculated, in the calculation of the free float of the leading diagram (pdm) should note that the introduction of a variety of logical relations, and activities to the presence

The various activities of the early start and end time, you can calculate the free time activities, leading figure in the calculation (PDM) of free time, it should be noted that the introduction of a number of logical relations between activities, and there is a delay can be, so the method of calcul

In calculates each activity starts most early after the closure time, may calculate active the free time difference, when calculates leader chart (PDM) the free time difference should pay attention, because has introduced many kinds of logical relations, and moves may have the time delay, therefore

Calculated after the early start and end time of the activity, the activity of free slack can be calculated, in calculating the leading figure (PDM) free slack should note that, due to the introduction of a variety of logic, and there can be delay between activities, so the calculation method and th

正在翻译，请等待...