阀门标准 BS 1212-3-1990 Float operated valves. part 3 Specification for diaphragm type float operated valves (plastics bodied) for coldwater services only.pdf [db:摘要] 4 年前 0 0 382 18
阀门标准 BS 1212-1-1990 Float operated valves. Specification for piston type float operated valves.pdf [db:摘要] 4 年前 0 0 386 18
