Tianjin yog lub nroog paub txog nws cov kev coj noj coj ua thiab kev sib koom ua ke thiab yog lub tsev rau cov kev daws teeb meem tshiab rau cov teeb meem kev lag luam. Ib qho kev daws teeb meem zoo li no yog lub twj tso kua mis piston corrosion-resistant, uas tau ua pov thawj nws lub peev xwm los kov yeej cov kev tsis zoo ntawm corrosion nyob rau hauv ib puag ncig kev lag luam. Corrosion yog ib qho teeb meem tshwm sim hauv ntau qhov kev lag luam, ua rau cov khoom puas tsuaj, cuam tshuam rau kev ua tau zoo thiab ua rau muaj nqi kho thiab poob qis. Tau ntsib nrog cov kev cov nyom no, corrosion-resistan ...
