Ob chav caij nplooj ntoos hlav tsim kom ntseeg tau tias lub peev xwm thauj khoom thiab kev ruaj ntseg ntawm cov swb tsheb ciav hlau hauv kev ua haujlwm kom ntau dua, thiab ruaj khov; Peb-section puv-rub tsim, muab ntau qhov chaw cia; 35KG load-cov kabmob.