Nekukura kwekugadzira tekinoroji, mhando dzakasiyana dzemashini ekuputira vacuum dzakabuda zvishoma nezvishoma, uye michina yekuputira vacuum inoshandiswa zvakanyanya mumaindasitiri akasiyana-siyana, akadai seaya anotevera: 1. Kushandiswa mumucheka wakaoma: maturusi ekucheka, molds uye kupfeka-kusagadzikana uye corrosion. -resistant zvikamu,...
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