The method of measuring c, s, p, Mn, Si, Cr, Ni, Mo, V, W, ti, Nb, Al element content by DV-4 photoelectric spectroscope on one condition is introduced.
介绍了应用DV - 4光电光谱仪，仅用一种测定条件，测定高合金钢中碳、硫、磷、锰、硅、铬、镍、钼、钒、钨、钛、铌、铝元素的含量的方法。
Cu, Se, Mn, Ni and V are necessary elements to plants growth.
铜、硒、锰、镍和钒是植物生长的必需元素。
Trace elements as Mn, Cr, Ni and V trend towards increases from shallow to deep water sedimentary settings, thus could be used to indicate relatively changes of paleo-water depth.
等元素的含量从浅水到深水总体呈增加之势，因此可以指示古水深的变化。
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