Category: News

Is b neg blood rare?

Score: 4.9/5 (57 votes) B negative blood is one of the rarest blood types as just 2% of our blood donors have it. In comparison, 36% of donors have O pos...

In portland pozzolana cement?

Score: 5/5 (25 votes) PPC is a type of blended cement. It consists of 15-35% pozzolanic material, 4% gypsum and the rest is clinker. PPC as per BIS code ...