Cov cuab yeej no yog tsim nyog rau kev txiav ntawm PCB pawg thawj coj saib tom qab kev ua haujlwm plug-in;
1 .Raws li cov khoom sib txawv, cov cua kub ceev tuaj yeem hloov kho.2. Vuam pob qij txha ntawm cov ntaub ntawv tshwj xeeb kom ntseeg tau tias cov khoom sib npaug ntawm qhov siab.