Hauv ntau qhov kev ua haujlwm, yog tias koj feem ntau siv chav dej, dej, lossis cov kua dej zoo tib yam, koj tuaj yeem xaiv cov hluav taws xob zoo tib yam, phau ntawv qhia, thiab pneumatically tswj ob txoj kev pob li qub.Txawm li cas los xij, yog tias koj ntsib cov khoom nrog cov khoom thiab xav tau hloov pauv thiab lwm yam xov xwm, koj yuav tsum xaiv V-shaped desig ...
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