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(1)CH4；煤(2)①②(3)风能（或地热能、潮汐能等）；1

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（1）医用体温计里的金属通常是汞；故答案为：汞；（2）金属可以制作电线说明金属具有良好的延展性和导电性；故答案为：导电；（3）胃中有胃酸，胃酸的主要成分是盐酸，故铁与盐酸反应的化学方程式为：Fe+2H

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折射

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