Fire hose couplings（）.
- Aare made of bronze，brass，or soft alloy metals
- Bshould be painted red in order to identify hose lengths
- Care specially hardened to prevent crushing
- Dshould be greased frequently
问题
Fire hose couplings（）.
参考解析：
分类：消防演习与作业题库
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耦合度（coupling）