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

出自：海船船员证

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