If the chromatographic operating conditions are not easily controlled to be unchanged during measurement process, which of the following is the better method to determine the component content()
A: normalization method
B: external standard method
C: internal standard method
D: calibration curve method
A: normalization method
B: external standard method
C: internal standard method
D: calibration curve method
举一反三
- Which of the following describes the two typical methods for material anthropogenic flow analysis A: The dynamic method tracing material flow process and the STAF method focusing on the specific area B: The mass conservation method and the statistical analysis method C: Material flow analysis method and life cycle analysis method D: Bottom-up method and top-down method
- In what way is the modified internal rate of return (MIRR) method better than the IRR method?
- 2. Which of the following methods is not commonly used to separate interfering components? ( ) A: Precipitation separation method B: Titration analysis C: Ion exchange method D: Chromatographic separation
- Which of the following methods is commonly used for total carbohydrates determination？ A: Phenol-sulfuric acid method B: DNS method C: Muson Walker method D: Somogyi- Nelson method
- What is not the basic statistical research method in the following method is ( ) A: Test method B: Statistical index method C: Mass Observation Method D: Statistical grouping