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GB/T 15972.31-2021
光纤试验方法规范 第31部分:机械性能的测量方法和试验程序 抗张强度
Specifications for optical fibre test methods—Part 31: Measurement methods and test procedures for mechanical characteristics—Tensile strength
GB/T 40410-2021
Metallic materials—Multiaxial fatigue testing—Axial-torsional strain-controlled method
GB/T 16840.4-2021
Technical determination methods for electrical fire evidence—Part 4: Metallographic analysis method
GB/T 40515-2021
Ships and marine technology—Globe valves for use in low temperature applications—Design and testing requirements
GB/T 40406-2021
Standard test method for static modulus of elasticity and poisson's ratio of carbon materials in compression
GB/T 40404-2021
Slag material—Measurement of melting temperature—High temperature metallographic method
GB/T 40407-2021
X-ray powder diffraction analysis method for determining the phases in portland cement clinker
GB/T 9239.12-2021
机械振动 转子平衡 第12部分:具有挠性特性的转子的平衡方法与允差
Mechanical vibration—Rotor balancing—Part 12: Procedures and tolerances for rotors with flexible behaviour
GB/T 18703-2021
Mechanical vibration and shock—Hand-arm vibration—Measurement and evaluation of the vibration transmissibility of gloves at the palm of the hand