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