Which of the following is correct for TLC using silica gel as absorbent? A: Higher the absorption activity of absorbent. larger k and smaller Rf B: Higher the absorption activity of absorbent. larger k and larger Rf C: Stronger the polarity of solvent. larger k and smaller Rf D: Weaker the polarity of solvent. larger k an d larger Rf

Which one is correct for description of TLC using silica gel as absorbent? A: Higher the absorption activity of absorbent. larger k and smaller Rf B: Higher the absorption activity of absorbent. larger k and larger Rf C: Stronger the polarity of solvent. larger k and smaller Rf D: Stronger the polarity of solvent. larger k and larger Rf

j=12，k=13求j&k的值。（） A: 8 B: 12 C: 13 D: 15

纸层析分离黄酮类化合物，以8%HAC水溶液展开时，苷Rf值小于苷的Rf值。

电路如图所示,已知R1 =10kΩ,Rf=100 kΩ,R2 =2 kΩ,RL=5 kΩ。求解在深度负反馈条件下的AUf.9fa175e0e74452e21e7b9c6f654d30fd.png

纸层析分离黄酮类化合物，以8%HAC水溶液展开时，苷元Rf值大于苷的Rf值。（）

纸色谱分离黄酮类化合物,以8%乙酸水溶液展开时,苷元的Rf大于苷的Rf。（)

智慧职教: 已知反向比例运算电路如图所示 已知Rf=30kΩ,R1=10kΩ，求Au=     ，Ri=    kΩ，R‘=     kΩ，Ro=    kΩ 7eead0a6d99d07300419088c0049437c

TLC中的比移值一般表示为 A: K B: k C: Rf D: tR E: R

若将文本字符串"15"、"8"、"6"按降序排序，则排序的结果为（） A: "15"、"8"、"6" B: "6"、"8"、"15" C: "8"、"6"、"15" D: "8"、"15"、"6\