管接头(① Sockets shall have parallel threads unless otherwise specified. 除非另有规定，管接头应具有直螺纹。② The sockets shall be manufactured either from steel similar to that of the tubes or from wrought iron. 管接头应使用与钢管相似的钢或熟铁制造。)
Socket(An identifier for a particular service on a particular node on a network. The socket consists of a node address and a port number, which identifies the service)
