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题目:有一电热器,有两根电阻丝,要烧开一壶水,仅用第一根需要24分钟;仅用第二根需要12分钟;若把二根并联煮开这壶水,则需要()
Title: There is an electric heater, there are two resistance wire, to boil a pot of water, only use the first root takes 24 minutes; only use the second root takes 12 minutes; if you put two pots in parallel to boil the pot water, you need ()