Ethintwe yilolu bhubhane, imboni yama-valve yomhlaba yathola umthelela omkhulu.I-China njengendawo eyinhloko yokukhiqiza yama-valve, inani lama-valve lokuthekelisa liselikhulu.I-Zhejiang, i-Jiangsu ne-Tianjin yizindawo ezintathu ezinkulu ezikhiqiza ama-valve e-China.Ama-valve ensimbi iningi...
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