The substitution of the medium-polar carbowax 20 Mfor the poalrer carbowax 2000 in the preparation of the gas chromatographic columns increases the column efficiency and the chronatographic separation degree.
用中等极性的聚乙二醇—20M固定液代替强极性的聚乙二醇—2000固定液制备气相色谱柱,提高了柱效能和色谱分高度。
Application of power line carrier on the intelligent drill string;
电力线载波技术在智能钻柱系统中的应用
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