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Where is the company's headquarters？
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In the third paragraph, the author mentions Franklin's inventions (such as the fire company, the improvements for city and the invention of the potbellied stove) to show that he was a man who had great sympathy and concern for the people.
Franklin compared himself to a worn-out carpet in order to show that he was too exhausted
Nobody was allowed to produce and sell the potbellied Franklin stove without Franklin's permission.
统计学的研究对象的两个基本特征是同质性和差异性。 ()
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