固定消防系统。气体灭火系统用元件。第13部分：止回阀要求和试验方法。
Fixed firefighting systems - Components for gas extinguishing systems - Part 13: requirements and test methods for check valves and non-return valves.
固定消防系统。气体灭火系统用元件。第13部分：止回阀要求和试验方法。
Fixed firefighting systems - Components for gas extinguishing systems - Part 13: requirements and test methods for check valves and non-return valves.
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