So far, indications point towards hydrogen energy. The combustion of hydrogen with oxygen produces water as its only ___4___, a better result than fossil fuels, such as coal or natural gas, which produce carbon dioxide (CO2) and other pollutants such as sulfur dioxide and nitrogen oxide.
发布于 2021-02-16 02:03:13
【单选题】
A consequence
B refinery
C compound
D byproduct
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