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Qhov zoo thiab qhov tsis zoo ntawm npauj npaim valve
Qhov Zoo: 1. Nws yog qhov yooj yim thiab qhib nrawm thiab kaw, nrog cov kua dej tsis kam thiab ua haujlwm yooj yim. 2. Cov qauv yooj yim, loj me me, lub sijhawm luv qauv ntev, me me ntim, lub teeb yuag, haum rau kev ntsuas caliber loj. 3. Nws tuaj yeem thauj cov av nkos thiab khaws cov kua qis tshaj plaws ntawm cov yeeb nkab qhov ncauj. 4. ...Nyeem ntxiv
