【Active participation for mutual improvement: 1.9–1.15 – +2 for participation, +3 to +10 for correct wealth】
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Multiple-choice question: 2 points for active participation, 2 points for each correct answer, 10 points for selecting all answers correctly; no points for selecting incorrect answers, and no points for resubmitting the answer. The most prominent feature of reference materials is ( ). A has quantitative accuracy. B is used for preparing standard titration solutions by the direct method. C is used for measurement purposes. D is used as a reference substance to calibrate the solution to be standardized. Correct answer: AC
A, C-------------------------
The most prominent feature of reference materials is (A having value accuracy C being used for metrological purposes).
A and C have value accuracy and are used for measurement purposes.