Ma board osindikizira (PCBs) ndi gawo lofunikira pazida zilizonse zamagetsi zomwe timagwiritsa ntchito masiku ano. Amapereka maziko a zida zamagetsi, kuonetsetsa kuti ntchito yoyenera ndi kugwirizana kwa magetsi. Komabe, popanga PCB, kusankha zida zoyenera kumatha kukhudza kwambiri magwiridwe antchito, ...
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