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GB/T 38206.5-2021
气动元件可靠性评估方法 第5部分:止回阀、梭阀、双压阀（与阀）、单向节流阀及快排阀
Methods to assess the reliability of pneumatic components—Part 5: Non-return valves, shuttle valves, dual pressure valves (AND function), one-way adjustable flow control valves, quick-exhaust valves
GB/T 40312-2021
磷铁 磷、硅、锰和钛含量的测定 波长色散X射线荧光光谱法（熔铸玻璃片法）
Ferrophosphorus—Determination of phosphorus, silicon, manganese and titanium content—Wavelength dispersive X-ray fluorescence spectrometry method (fused cast bead method)
GB/T 39715.2-2021
Plastics—Biobased content—Part 2: Determination of biobased carbon content
GB/T 40316-2021
Welded high strength shaped and round steel tubes for automobile structure
GB/T 223.90-2021
Iron, steel and alloy—Determination of silicon content—Inductively coupled plasma atomic emission spectrometric method
GB/T 6132-2021
Interchangeability dimensions for milling cutter or milling cutter arbors
GB/T 6110-2021
Drawing dies—Carbide alloy drawing dies—Structural types and dimensions
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
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