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1A_ SCIENCE_CH5.3_Energy sources_Bk_P.120-122

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1A_ SCIENCE_CH5.3_Energy sources_Bk_P.120-122

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1A_ SCIENCE_CH5.3_Energy sources_Bk_P.132-133

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1A_ SCIENCE_CH5.3_Energy sources_Bk_P.132-133

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1C_SCJ_5.1_energy conversion and steam engine_10

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