【Daily Question】Chemical Analysis Edition, 2020.2.2
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This post was last edited by zjp on 2020-2-2 at 09:59. Multiple-choice question: When sampling from randomly distributed and non-homogeneous materials, it can be done in (). A. Perform stratified sampling, and wherever possible, collect samples from each stratum with different characteristic values that are representative of the material in that stratum. B. Sampling should be conducted along the material flow line; the sampling frequency must be higher than the rate at which the material’s characteristic values change. It is crucial to avoid synchronizing the two. C. Random sampling can be used, as well as non-random sampling. D. It can be performed at any location; care should be taken not to introduce any impurities, so as to prevent any changes in the material. C
C. Random sampling is possible, as is non-random sampling