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GB/T 34523-2017 航天器剩余推进剂质量的估算方法 Estimating methods for the mass of remaining propellant of sp...2023-09-22

GB/T 16137-2021X射线诊断中受检者器官剂量的估算方法Methods for estimation of examinee's organ doses in X-ray ...2022-10-24