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Helium is the lightest rare gas.
氦是最轻的稀有气体。
youdao
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Research and application of rare earth in the purification of automobile tail gas;
开发研制了用于汽车尾气净化的以蜂窝状陶瓷为基体的三元催化剂。
youdao
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Research and application of rare earth in the purification of automobile tail gas;
开发研制了用于汽车尾气净化的以蜂窝状陶瓷为基体的三元催化剂。
youdao