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JIS B1856-2018 同步皮带传动--帝国螺距梯形轮廓系统--皮带和滑轮 Synchronous belt drives -- Imperial pitch trap...2023-12-21

GB/T 37203-2018 同步带传动 AT型梯形齿同步带 Synchronous belt drives-Belts with AT trapezoidal profile system...2023-09-02

DIN 4925-2-2017 Well screens and casings of unplasticized polyvinylchloride (PVC-U) for tube wells - Part 2...2023-06-24

BS ISO 2902-2016 ISO公制梯形螺纹总计划 ISO metric trapezoidal screw threads. General plan2023-06-12

GB/T 28775-2021同步带传动 T型梯形齿同步带轮Synchronous belt drives. Pulley with T trapezoidal profile system...2022-10-24

GB/T 5796.3-2022梯形螺纹第3部分：基本尺寸Trapezoidal screw threads—Part 3: Basic dimensions2022-10-26

GB/T 5796.4-2022梯形螺纹第4部分：公差Trapezoidal screw threads—Part 4: Tolerances2022-10-26

GB/T 5796.1-2022梯形螺纹第1部分：牙型Trapezoidal screw threads—Part 1: Profiles2022-10-26

GB/T 5796.2-2022梯形螺纹第2部分：直径与螺距系列Trapezoidal screw threads—Part 2: General plan...2022-10-26

GB/T 5796.2-2005梯形螺纹第2部分;直径与螺距系列Trapezoidal screw threads—Part 2:General plan...2022-06-14

Control over Surrounding Rocks Deformation of Soft Floor and Whole-Coal Gateways with Trapezoidal Su2020-06-12