• YD/T 3877-2021 互联网新通用顶级域名服务 域名注册协议启动期技术要求.pdf
• JIS B2011-2004 Bronze gate globe angle and check valves(Amendment 1).pdf
• JIS B2011-2009 Bronze gate globe angle and check valves(Amendment 2).pdf
• BS 1868-1975(R1990) Steel check valves(flanged and butt-welding ends) for the petroleumpetrochemical and allied industries.pdf
• JIS F 7373-1996 Shipbuilding-Cast iron 10K swing check valves.pdf