首页学历类考试电大国家开放大学《自然科学基础》
(填空题)

重氢(氘)和氧化合成的水叫做“()”,海水中总量可达250亿吨,现在已是()运行不可缺少的辅助材料,还是制取氘的原料。在海水中的氘有()吨,足够人类用上千万亿年。

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