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北漂青年祖波是一名程序员，他热爱自己的工作，平时的生活异常简单，除了工作就是呆在“包租婆”波妈慧芳在北京早年购置的房子里钻研写代码。祖波平静的生活，却被波妈的一通电话打破，他被告知广东老家的三叔公要来北京暂住他家，波妈还再三强调，要好好接待三叔公。虽然祖波早已对这位远方亲戚没了印象，但还是做好了准备，推着轮椅去车站接“老人家“。没想到波妈口中的三叔公，其实是一位和祖波同龄的年轻人，只是因为辈分高，成了“叔公”。祖波开始还有些抗拒，在听到叔公也是“程序员”的时候，他放下戒备，带着叔公回了家。若是等到项羽一切准备停当，先行发难的话，齐国将只能是被动的抵抗。Indoor fire hydrant pipe network form (ring-shaped and branch-shaped) and pipe diameter, number of fire hydrants, location and number of water pump adapters, and whether there is a roof fire water tank connected with this system.[Published Time] February 14, 2016In this example, the policy pattern is used to encapsulate the algorithm. However, in practice, it can be used to encapsulate almost any type of rules, as long as the similarities between different rules are analyzed and abstractedIdentify the problemInitialValue whose value is used for the first parameter of the first call to callback