A: Precipitation separation method
B: Titration analysis
C: Ion exchange method
D: Chromatographic separation
举一反三
- The purification methods commonly used in the analysis of traditional<br/>Chinese medicine preparations include ( ) A: Liquid-liquid extraction B: chromatography C: precipitation method D: distillation
- 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
- The most commonly used methods for clinical examination of Ascaris<br/>lumbricoides are () A: Floating polymerization of saturated brine B: Direct smear method C: Insect identification D: Water washing precipitation method
- 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
- 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
内容
- 0
Which of the following is NOT the training method that comes under behavioral methods?
- 1
Commonly used resource evaluation methods of play include: A: Trap addition method B: Reservoir scale sequence method C: Extrapolation of exploration trend D: Resource abundance analogy
- 2
Which the following ways can be used to obtain attribute weight for Attribute-Weighted KNN? A: Prior knowledge / experience. B: PCA, FA (Factor analysis method) C: Information gain. D: Gradient descent, simplex methods and genetic algorithm.
- 3
Which of the following is false? ( ) A: A static method must be used to access private static instance variables. B: A static method can be accessed even when no objects of its class have been instantiated. C: A static method has no this reference. D: A static method can call instance methods directly.
- 4
The commonly used methods for the study of drug polymorphs do not include A: DSC B: X-ray diffraction C: thermal microscope D: HPLC method