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So far, indications point towards hydrogen energy. The combustion of hydrogen with oxygen produces water as its only byproduct, a better result than fossil fuels, such as coal or natural gas, which produce carbon dioxide (CO2) and other _5_ such as sulfur dioxide and nitrogen oxide.

发布于 2021-02-16 02:03:13

【单选题】
A components
B objects
C pollutants
D catalysts

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