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【单选题】
在实际气相色谱分析时常采用相对保留值(r1,2)作定性分析依据,其优点是
A.
相对保留值r1,2没有单位
B.
相对保留值r1,2数值较小
C.
相对保留值r1,2不受操作条件影响
D.
相对保留值r1,2容易得到
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