When joining the female coupling of the fire hose to the male outlet of the hydrant，you should make sure that the（）.<br>A:threads are lubricated<br>B:nozzle is attached to the hose<br>C:female coupling has a gasket<br>D:hose is led out

When joining the female coupling of the fire hose to the male outlet of the hydrant，you should make sure that the（）.
A:threads are lubricated
B:nozzle is attached to the hose
C:female coupling has a gasket
D:hose is led out

出自：海船船员证

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