Phunzirani njira zambiri zogwirira ntchito ku mercury zomwe zimachitika mukamagwira ntchito kapena pafupi ndi "siliva" amalgam.
Phunzirani njira zambiri zogwirira ntchito ku mercury zomwe zimachitika mukamagwira ntchito kapena pafupi ndi "siliva" amalgam.