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1 Tsis txhob sawv ntawm lub cuab yeej lossis lub tub rau khoom kom tsis txhob muaj xwm txheej; 2. Cov khoom hnyav yuav tsum tsis pub tshaj qhov siab tshaj qhov hnyav ntawm lub tub rau khoom; 3 Thov hnav hnab looj tes thaum siv cov cuab yeej kom tsis txhob raug khawb los ntawm cov khoom ntse lossis cov khoom ntxhib; 4 Thaum xaiv lub thawv cuab yeej, lub thawv cuab yeej yuav tsum tau ntawv pov thawj. Piv txwv li, daim ntawv pov thawj paub zoo yog German VPA tau lees paub 5 lub thawv yas, uas feem ntau yog ua los ntawm cov yas yas. Tsis txhob khob nws nrog cov khoom tawv kom tsis txhob tawg; 6 Hlau lub thawv, qhov yooj yim nto yog feem ntau pleev xim los yog galvanized, thiab tsis txhob siv cov khoom tawv los khawb qhov saum npoo; 7 Thaum khaws cov khoom, muab tso rau hauv thiaj li ua kom lawv qhov chaw khaws cia