Cov hlau nto yuav tsum du thiab tsis xeb. Cov plating yuav tsum tsis txhob crease lossis tev tawm. Cov yas casing yuav tsum tsis txhob sib npaug, nyoos lossis muaj qhov tawg lossis puas tsuaj. Cov rwb thaiv tsev ntawm ntau qhov chaw uas coj hluav taws xob yuav tsum dais lub luag haujlwm ntawm kev sim voltage thiab muaj
tsis muaj qhov punctures rau nws.
90% ntawm qhov chaw yuav raug them los ntawm cov laug cam. Tsis muaj kev hloov pauv ntawm lub hauv paus,
tuaj yeem ua kom txaus siab rau kev ua haujlwm ntawm lub tshuab, hluav taws xob. Kev ua haujlwm yam tsis muaj kev thaiv
qhov xwm txheej, khawm tso cai rau qhov hnav nto