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what is these spots on BEC

Posted: 07 Sep 2019, 08:31
by msafdel
hi friends
what's these spots on my BEC? could they be dangerous?
please guide me, thanks

Images:
https://1drv.ms/u/s!AhTBIN1sVnrvqBb1jh2 ... c?e=RytgS1
https://imgur.com/a/D5JPDY9