double-hinged arch

arch的翻... ... discharging relieving arch 减重拱(置于石、木楣之上以减轻楣的负荷) double-hinged arch 双铰拱 drop arch 垂拱 ...

hinged cockpit hood是什么意思_hinged... ... double-hinged arch 两铰拱 exhaust pipe with hinged flaps 铰接摺瓣排气管 ...