The positively charged central region of an atom,composed of protons and neutrons and containing almost all of the mass of the atom.
英
美
- 原子核原子的正极中心部分,由质子和中子构成,几乎集中了原子的全部质量。
- 今日热词
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- 深远海浮式风电平台 - deep-sea floating wind power platform
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- 京雄高速公路 - Beijing-Xiongan expressway
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- 农业及相关产业增加值 - the added value of agriculture and related industries