TLC中的比移值一般表示为
A: K
B: k
C: Rf
D: tR
E: R
A: K
B: k
C: Rf
D: tR
E: R
C
举一反三
- TLC中的主要参数是()。 A: tR B: W C: Rf D: h E: A
- 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
- CRH2型动车组设备代号中,时间继电器用表示() A: R B: TR C: K D: N
- 在极性溶剂中:1分() A: K带<br/>蓝移,R带蓝移 B: K带<br/>红移,R带<br/>红移 C: K带<br/>蓝移,R带<br/>红移 D: K带<br/>红移,R带<br/>蓝移
内容
- 0
tR表示 A: 相对保留时间 B: 相对标准偏差 C: 比旋度 D: 比移值 E: 半衰期
- 1
TLC法中的R1为 A: 比移值 B: 比旋度 C: 吸光度 D: 峰面积 E: 折光率
- 2
韦伯定律用公式表示为( )。 A: K=△I/I B: S=K·lgR C: S=K·In D: E=1/R
- 3
为减少切削加工表面粗糙度值,可以使()。 A: f↓ Kr↓ K/r↓ rε↑ B: f↑ Kr↓<br/>K/r↓ rε↓ C: f↓ Kr↑ K/r↑ rε↑ D: f↑ Kr↑ K/r↑ rε↓
- 4
速率理论方程式(范氏方程式)是 A: H=L/n B: Rf=l/lo C: H=A+B/u十Cu D: tR=to(1十k) E: K=Cs/Cm