Fire hose couplings_________.(1.0)
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正确答案A
Fire hose couplings_________.(1.0)
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正确答案A
