China cheke chivundikiro cha valve: kuyenda kosasinthika
China cheke valavu defect kusanthula: kusasinthika kuyenda China valavu valavu ndi kaŵirikaŵiri kulamulira madzimadzi zida, amene ali ndi ubwino kupewa countercurrent ndi kusindikiza bwino. Komabe, ma valavu aku China ali ndi zovuta zina, zazikulu pakati pa ...
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