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【单选题】
在液相色谱中,为了改变色谱柱的选择性,下列可以进行的操作是
A.
改变流动相的种类或柱长
B.
改变固定相的种类或柱长
C.
改变固定相的种类和流动相的种类
D.
改变填料的粒度和柱长
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In the workplace, it is important to recognize attitudes of employees because attitudes are a component of behavior.
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