[Civil Engineering Version] Daily Question 20171103

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Among the following options, which one correctly describes the regulations regarding sampling and specimen retention for the concrete strength of structural members? 　　A. For every 100 batches of concrete with the same mix ratio and a volume not exceeding 200 m3, sampling must be carried out at least once. 　　B. When less than 100 batches of concrete with the same mix ratio are prepared per working shift, sampling shall be carried out at least once. 　　C. When a single continuous pouring volume exceeds 500 m3, sampling of concrete with the same mix ratio must be carried out at least once every 200 m3. D. For each floor, sampling of concrete with the same mix ratio must be done at least once. E. At least 2 sets of standard curing specimens should be retained for each sampling; the number of sets of specimens cured under the same conditions should be determined based on actual needs.