说明：  排队论（姜启源-数学建模）在教科书第5.5节实施港口系统模型。 获得港口中船舶的平均时间，港口船舶的最长时间，船舶的平均等待时间，船舶的最长等待时间，时间的百分比码头设施在以下情况下空闲，至少进行模拟 1000艘船。 （a）连续船舶之间的时间是在15和145分钟之间均匀分布的随机变量。 每艘船的卸载时间从45分钟均匀分布到90分钟。
(Queuing model- Implement the harbor system models in Section 5.5 of the textbook. Obtain Average time of a ship in the harbor, maximum time of a ship in the harbor, average waiting time of a ship, maximum waiting time of a ship, percentage of time dock facilities are idle for the following scenarios by performing simulation for at least 1000 ships. (a) Time between successive ships is a random variable uniformly distributed between 15 and 145 min. Unloading time per ship is uniformly distributed 45 to 90 min.)