Emergency Open valve Emergency Open valve used in water spray fire-extinguishing systems, has yet to be implemented in engineering.
紧急开启阀应用于水喷雾灭火系统，目前尚未在工程中实施。
Emergency Open valve Emergency Open valve used in water spray fire-extinguishing systems, has yet to be implemented in engineering.
紧急开启阀应用于水喷雾灭火系统，目前尚未在工程中实施。
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