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At present, at least 19 provinces have implemented "dysmenorrhea leave", allowing female employees to rest for one or two days during special periods. However, the regulations vary from place to place. Some regulations only need to provide certificates from medical institutions, while others limit the types of work, allowing only female employees in "third-level physical labor intensity" and "long-term standing and walking work" to take "dysmenorrhea leave".《万万没想到之小兵过年》是“2013第一网络神剧”《万万没想到》的贺岁特别番，由优酷出品、湖南卫视和万合天宜共同打造。该剧在延续《万万没想到》第一季幽默风格的同时，特别将人物设定在经典三国背景，并结合时下春节的热门话题，演绎了一出别有趣味的三国年关百味。我没有瞧不起……只是南洋的男人太过矮陋了……杨必归挠头道，迪哥还算好看的。适逢事业上升期、生活奋斗期，田蓓蕾和郭一鸣这对在北京工作的小夫妻意外怀上了二胎，双方父母两处奔来，四个老人抛家舍业立志为儿孙当“北漂”。一个屋檐下，两地、三代、七口人上演起悲喜交加的家庭情感故事 。要强的田蓓蕾为前途孤注一掷丢了工作，独辟蹊径又柳暗花明；厚道的郭一鸣身受家里家外两重压力力撑梁柱，两人走到离婚的尽途又温情回归。四位老人为爱“斗法”，两度折返北京，又分别立足。一系列现实的问题如儿...Liskov Substitution Principle, LSP (Richter Substitution Principle) means that subclasses must replace their parent types. In other words, in the process of software development, after the subclass replaces the parent class, the behavior of the program is the same. Only when the subclass replaces the parent class and the function of the software is not affected can the parent class be truly reused, and the subclass can also add new behaviors to the parent class. In order to look at an example of violation of LSP principles, the specific code is as follows:Chapter 4 Gold Standard自此，关中百姓算是恨透了项羽。