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Master Control End: The master control end is some hosts illegally invaded and controlled by attackers. These hosts also control a large number of proxy hosts respectively. Specific programs are installed on the master host, so they can accept special instructions from attackers and send these commands to the proxy host.《台北歌手》（英文名：ROSEKI 1914），2018年台灣時代劇。由莫子儀、黃姵嘉、楊小黎領銜主演，於2017年開鏡，客家電視台於2018年4月2日上檔。本劇講述台灣第一才子呂赫若的故事。Information on Indoor and Outdoor Fire Fighting Facilities人类在各个领域的进步过程，塑造出成就非凡的工业化时代，而且多半为大家所乐见。然而，我们在课堂上学到的这两百年历史却充满了偏颇思维，现在应该去思考进步背后的历史，并了解我们所认为的进步过程。人们想到吴晗,便会想到文化大革命。因为文革的序幕是从批判吴晗的《海瑞罢官》和有吴晗在内的三家村拉开的。这位在民主革命中和李公朴、闻一多并肩战斗的历史学家,为北京人民造福、为社会主义革命和建设作出贡献。Is to define a main method calculate in the AbstractCalculator class, calculate () calls spilt (), etc. Plus and Minus inherit the AbstractCalculator class respectively, and implement the call to subclasses through the call to AbstractCalculator, see the following example: