GB/T 3670-2021銅及銅合金焊條Covered electrodes for manual metal arc welding of copper and copper alloys

上一條：GB/T 31723.413-2021金屬通信電纜試驗方法 第4-13部分：電磁兼容 鏈路和信道(實(shí)驗室條件)的耦合衰減 吸收鉗法Metallic communication cable test methods—Part 4-13: Electromagnetic compatibility (EMC)—Coupling attenuation of links and channels(laboratory conditions)—Absorbing clamp method

下一條：GB/T 41163-2021煤礦井下煤層水射流沖擊增透工藝設計規范Specification for process design of enhancing coal seam permeability by water jet in coalmine

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