室内消火栓阀杆采用奥氏体型不锈钢棒代替铅黄铜棒的可行性探讨
실내소화전벌간채용오씨체형불수강봉대체연황동봉적가행성탐토
Discussion on the viability of austenitic-stainless-steel substituting lead brass in valve bar of indoor fire hydrant