nd (neutral density)

 
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nd (neutral density)的英文翻譯是什么意思,詞典釋義與在線(xiàn)翻譯:

英英釋義

名詞 nd:
  1. a yellow trivalent metallic element of the rare earth group; occurs in monazite and bastnasite in association with cerium and lanthanum and praseodymium

  2. a state of north central United States bordering on Canada

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