period 1 element造句

"period 1 element"是什么意思   

例句与造句

  1. The other period 1 element, helium, is sometimes placed separately from any group as well.
  2. It's difficult to find period 1 element in a sentence. 用period 1 element造句挺难的

相关词汇

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  2. "periocular dermatitis"造句
  3. "period"造句
  4. "period 0"造句
  5. "period 1"造句
  6. "period 10"造句
  7. "period 2"造句
  8. "period 2 element"造句
  9. "period 3"造句
  10. "period 3 element"造句
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