| 单词 | platinum-iridium |
| 释义 | > as lemmasplatinum-iridium platinum-iridium n. ΚΠ 1865 Proc. Royal Soc. 14 160 The standard obtained has been expressed in platinum, in a gold-silver alloy, in a platinum-silver alloy, in a platinum-iridium alloy, and in mercury. 1901 Brit. Med. Jrnl. No. 2095 (Epitome) 32 The author recommends electrolysis with a platinum-iridium needle. 1993 R. J. Pond Introd. Engin. Technol. (ed. 2) v. 102 The primary standard for the kilogram is a cylinder of platinum-iridium alloy kept by the International Bureau of Weights and Measures in Paris, France. < as lemmas |
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