The REE contents of 84 placer gold samples and 7 hard rock gold samples in Heilongjiang province are determined by plasma massspectrographicanalysis.
对黑龙江省84个砂金样品及7个岩金样品，用等离子质谱仪分析了它们的稀土元素含量。
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In this paper the quadrupole massspectrographicanalysis of the operation characteristics of Zr-Al pump is described and some questions which deserve to study and improve.