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小葱接过去展开一看，再次呆住了，眼睛一红，泪水就灌满眼眶。The earliest measurement division of 12 units and 60 units came from Sumerians in Mesopotamia between the Euphrates and Tigris rivers between 4000 BC and 2000 BC, who created the first high civilization of mankind. The invention of wheels and cuneiform characters divided the whole into 12 units (12 months a year, the concept of "one dozen") and 60 units of measurement system (minute hand)1949年12月，上海解放半年，潜伏在上海的国民党大特务头子陈恭鹏笼络了一大批旧上海的投机商，操纵银元黑市交易，并大肆伪造人民币投放市场，致使银元价格狂飚，人民币信用暴跌，物价随之飞涨，情势万分危急。为粉碎“光复社”的破坏活动，上海市军管会命令治安管理委员会和地下党，成立“铁流行动小组”，侦察英雄燕双鹰奉命乔装成旧上海的青帮老大，以其特有的方式先与陈恭鹏展开争斗，在陈觉得筋疲力尽与他谈和之时，趁机卧底到光复社内部。在残酷的斗争中，铁流小组组长张桥付出了生命的代价保护了燕双鹰。最终，燕双鹰获得了陈恭鹏的信任，挖出了隐藏在铁流小组中的内奸，抓捕了银元投机商，一举破获假钞印制厂，彻底粉碎了敌人的阴谋，将以陈恭鹏为首的潜伏敌特一网打尽。Public Enumeration < TreeNode > getChildren () {-Mast lights, 5 nautical miles, but ships less than 20m in length, 3 nautical miles: