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原子质量数大于1的氢的同位素；氘或氚。
An isotope of hydrogen with mass number greater than 1; deuterium or tritium.
youdao
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锕铀铀的同位素，原子质量数为235，与慢。
The isotope of uranium with mass number235, fissionable with slow neutrons.
youdao
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锕铀铀的同位素，原子质量数为235，与慢。
The isotope of uranium with mass number235, fissionable with slow neutrons.
youdao