PCB sawv cev rau lub rooj tsav xwm luam tawm thiab nws yog ib qho tseem ceeb hauv hluav taws xob. Peb tuaj yeem pom qee qhov cim ntawm PCB. Koj puas tau xav paub tias cov cim no raug tsim li cas? Zoo, lawv yog tsim los ntawm UV laser npav tshuab.
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