| 单词 | major element |
| 释义 | > as lemmasmajor element major element n. spec. a chemical element that is present or required in relatively large amounts; (Biology) = macronutrient n.; (Geology) an element that constitutes more than 5 per cent of a rock. ΚΠ 1950 Proc. Royal Soc. Canada 44 227 Spectrographic methods of determination of the major elements of rocks have been developed in an attempt to supplement more costly and time-consuming chemical analyses. 1950 Webster's New Internat. Dict. Eng. Lang. Add. Major element = Macronutrient. 1952 A. M. Smith Manures & Fertilisers viii. 190 In the past, attention was directed exclusively to the major elements and the physical condition of the soil, so that a disorder in the plant which could not be explained in terms of a major deficiency or an attack by fungus or insect had to be dismissed as ‘soil-sickness’. 1964 Geochim. et Cosmochim. Acta 28 793 Forty-two tektites and two ‘amerikanites’ were..analysed for major elements. 1993 Jrnl. Petrol. 34 472 The major elements plus Rb, Sr, and Ni were determined by X-ray fluorescence (XRF) methods. < as lemmas |
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