【Daily Question】Chemical Analysis Edition, 3/14/2022
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**The validity period of a standard is generally ( ) years. C A, 2 years B, 3 years C, 5 years D, 10 years
C Explanation: Due to differences among countries, the validity period of standards also varies. It is reviewed every 5 years in accordance with ISO standards, with an average age of 4.92 years. China’s **standard management regulations** stipulate that standards must be reviewed within 5 years of their implementation; in other words, the **validity period of a standard is generally 5 years**.