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The examination questions on the metrological inspection of prepackaged goods cover the \"Measures for the Supervision and Management of Metrology of Prepackaged Goods\", JJF1070-2005 Rules for Metrological Inspection of the Net Content of Prepackaged Goods, JJF 1070.1-2011 Rules for Metrological Inspection of the Net Content of Prepackaged Goods (Soaps), and JJF1070.2-2011 Rules for Metrological Inspection of the Net Content of Prepackaged Goods (Wheat Flour). I. Fill-in-the-blank questions: (15 questions in total, 4 points each) 1. Quantitatively packaged goods refer to pre-packaged products that are intended for (sale) and have uniform quality, volume, length, area, or count specifications within a (specified range). 2. The net content indication consists of three parts: (net content), (number), and (legal unit of measurement). Those marked with (length), (area), and (count unit) can be exempt from indicating the net content. 3. Producers and sellers of prepackaged goods shall be equipped with (measurement and testing equipment suitable for the production of such prepackaged goods) to ensure that the prepackaged goods they produce and sell comply with the relevant regulations. 4. Sampling can be divided into three types depending on the sampling location: (systematic sampling), (stratified sampling), and (simple random sampling). 5. When sampling for the inspection of the net content of quantitatively packaged goods, if the inspection batch size is 335 units, the sample size to be taken should be (50) units. 6. Where mandatory **standards or mandatory industry standards have stipulated the allowable shortage amount for quantitatively packaged goods as well as the choice of legal units of measurement, such provisions shall apply. 7. The actual content refers to the amount actually contained in a quantitatively packaged product, as determined through measurement and inspection by a metrological verification institution authorized by the quality and technical supervision department, in accordance with the \"Rules for Metrological Inspection of the Net Content of Quantitatively Packaged Goods\". 8. Net content refers to the amount of the product inside (after removing the packaging container and other packaging materials). 9. When inspecting quantitatively packaged goods, reasonable changes in the net content of the goods that may be caused by environmental conditions such as storage and transportation should be taken into account. 10. The three testing methods for determining the net content of goods in terms of length units are (instrumental method), (weighing method), and (linear method). 11. For the inspection of products whose net content is indicated in volume units, the volume of such products is measured under conditions of (20±2°C). 12. The expanded uncertainty of the measurement results for the net content of quantitatively packaged goods shall not exceed (0.2T). 13. When the batch size of a test lot is less than 10 units, only the actual content of each individually packaged product is tested and evaluated; no calculation of the average actual content is performed. 14. For soaps with a production date within 5 days, the net content is tested in accordance with the methods specified in JJF1070-2005; for soaps with a production date more than 6 days old, only the () of the test samples is examined and evaluated, and no calculation of (average actual content) is performed. 15. When conducting random inspections of the net content of wheat flour in the production sector, if the measured moisture level is less than or equal to the maximum allowable value, no moisture correction is applied. Flow rate quantitative controller: yunrun.com.cn/product/1902.html II. Essay questions: (3 questions in total, 10 points for each) 1. Briefly describe the evaluation criteria for the net content of quantitatively packaged goods as specified in JJF1070. Answer: A test batch is classified as an unqualified batch if any of the following conditions apply: ① The average actual content of the samples is less than the stated net content, and even after correction using the values in Column 3 of Table 2, it remains less than the stated net content ； ②The number of units of individually packaged goods whose actual content is more than 1 time less than the specified amount, but less than or equal to 2 times the allowable shortage, exceeds the quantity specified in the fourth column of Table 2 ； ③One or more quantitatively packaged goods have a shortage in actual content that is more than twice the specified allowable shortage amount. 2. A sample of 13 items was selected; please briefly describe the steps for checking their tare weight (how to determine the tare weight). Answer: ① Randomly select 2 samples from the sample set, and determine the difference in their net content weights (Rc) as well as the difference in their tare weights (Rt) ； ②Using the ratio of Rc/Rt and a sample size of 13 as references, a table is consulted to determine the number of samples for tare sampling, which includes the 2 samples that have already been taken ； ③Calculate the average tare weight of the n tare weight measurements to obtain the average tare weight for that batch of samples. 3. Determine how many scenarios there are for inspection lots? How should inspection lots be determined for each situation? Answer: The products in a inspection batch should be those that have passed the producer’s own quality checks, or products available in the sales market. The determination of the inspection batch size is divided into the following two cases: ① Sampling is carried out at the production or packaging site, from a certain quantity of identical quantitatively packaged products manufactured by the producer under identical production conditions ； ②Sampling is conducted in the warehouses of manufacturing enterprises, importers, wholesalers, and retailers, as well as at retail outlets; a batch is defined as the entire quantity of packaged goods of the same type present at the sampling location within the enterprise. III. Calculation questions: (1 question in total, 10 points for each question) In a certain inspection, 13 pre-packaged products labeled with a net content of 100g were sampled. The actual content of each product, as shown in the table below, was determined. Please calculate whether the net content of this batch of products meets the standards, and provide the basis for such a determination. (Correction value: 1.5g, allowable shortage: 4.5g) Solution: Average actual content after correction: 100.1g ； Number of T1 class shortage items: 1 ； Number of T2 category shortage items: 0 ； The net content of this inspection lot is qualified.