All things being equal, the best solution is the one that takes the least amount of total time (including maintenance time for fixing and support).
当所有事情的机会成本均等时，最好的解决方案是选择那个总时间花费最少的(包括修理和维护的时间)。
A constructible definition of the directed acyclic graph was described, and the reason why exists a solution that does not exceed the total execution time of all tasks was explained.
描述了有向无回路图的构造性定义，指出问题一定有不超过所有任务执行时间总和的解。
Analytic solution of temperature pattern of round heat sources is presented under the changing discharge channel radius with time and fixed input total power.
得到在随时间变化的通道半径和固定输入总功率表面热源条件下的温度场计算公式。
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