Fire hose couplings（）.<br>A:are made of bronze，brass，or soft alloy metals<br>B:should be painted red in order to identify hose lengths<br>C:are specially hardened to prevent crushing<br>D:should be greased frequently

Fire hose couplings（）.
A:are made of bronze，brass，or soft alloy metals
B:should be painted red in order to identify hose lengths
C:are specially hardened to prevent crushing
D:should be greased frequently

出自：海船船员证

提示：
同一【IP】的非会员用户每天可免费获取10次答案

收藏本站【zk.995w.com】，下次访问不迷路

本站试题总数:【10245403】个 (题库试题定时更新)