英语词汇“primary rays”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	primary rays
释义	primary rays pri·mar·y rays 1. cosmic rays in the form in which they first strike the atmosphere; 2. x-rays generated at the focal spot of the tube. Synonym(s): direct rays
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primary rays