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【单选题】
HPLC与GC相比,可以忽略纵向扩散项的主要原因是A.
柱前压力大
B.
流速比GC快
C.
流动相的黏度大
D.
柱温低
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反馈参考答案：
举一反三
【简答题】超滤系数(ultrafiltration coefficient，Kf)
【简答题】克郎α系数(Cronbach α Coefficient)
【简答题】克郎α系数(Cronbach α Coefficient)
【简答题】野外测量工作的基准面是()
【多选题】Regarding correlation coefficient, which of the following are true?
A.
If the correlation coefficient of two attributes is 0, then the two attributes are independent.
B.
If the correlation coefficient of two attributes is greater than 0, then there is causality between the two attributes.
C.
If we normalize two attributes with z-score normalization, then their correlation coefficient is equal to their covariance.
D.
Correlation coefficient can be used to detect the redundancy among attributes.
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