... 直立投影 V-projection 直立迹 V-trace 硬橡皮 vulcanite ...
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v type fire trace v形火灾痕迹
TRACE V 查出
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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