单词 | ultra-pure |
释义 | > as lemmasultra-pure ultra-pure adj. Brit. , U.S. ΚΠ 1961 New Scientist 26 Oct. 237/2 Ultra-pure or conductivity water was, until a few years ago, a substance made in small quantities by multiple distillation..mainly for use in research laboratories. 1973 Nature 13 Apr. 482/3 The preparation, handling containment and analysis of ultrapure materials. < as lemmas |
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