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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
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special wrench for tightening couplings in a fire hose lineC
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单选题Fire hose should be washed with（）.A
salt water and a wire brushB
caustic soapC
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a holystone
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