当煤炭在氧气中加热时经化学反应会形成二氧化碳和氢气。

When heated in oxygen, coal reacts to form carbon dioxide and hydrogen.

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当煤炭在氧气中加热时经化学反应会形成二氧化碳和氢气。

When heated in oxygen, coal reacts to form carbon dioxide and hydrogen.

youdao