常見例句雙語(yǔ)例句The reasons for invalid cathodic protection by rectifier in gas transmission pipeline in Lanzhou City are analyzed, and the concrete reconstruction treatment measures are put forward.分析了蘭州燃?xì)廨敋夤艿劳饧与娫搓帢O保護(hù)失效的原因，提出了具體的改造處理措施。 返回 cathodic protection rectifier