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
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
举一反三
- 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
- In general, the damping ratio of steel structures is than that of the reinforced concrete structure. That is, the seismic action of the steel structure is than that of the reinforced concrete structure under the same structure period, mass and other parameters. ( ) A: smaller smaller B: smaller larger C: larger smaller D: larger larger
- The money supply increases when the Fed A: buys bonds. The increase will be larger the smaller the reserve ratio is. B: buys bonds. The increase will be larger the larger the reserve ratio is. C: sells bonds. The increase will be larger the smaller the reserve ratio is. D: sells bonds. The increase will be larger the larger the reserve ratio is.
- On a production function, as capital per worker increases, output per worker A: increases. This increase is larger at larger values of capital per worker. B: increases. This increase is smaller at larger values of capital per worker. C: decreases. This decrease is larger at larger value of capital per worker. D: decreases. This decrease is smaller at larger value of capital per worker.
- In revised editions of charts the ___ are corrected first. A: smaller scales B: larger scales C: smaller scales and larger scales D: moderate scales