emergency cut-off valve

网络释义

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2.	快关阀快关蝶阀,rapid cut-off butterfly... ... ) quick-opening butterfly valve 蝶式快开阀 ) Emergency cut-off valve 快关阀 ... www.dictall.com
3.	紧急切断球阀阀 ... 1. emergency valve 紧急切断阀 2. emergency cut-off valve 紧急切断球阀阀 1. Emergeny Cut-off Valves 消音器切断阀 ... www.iciba.com