Question

अपशिष्ट जल उपचार के किस चरण में रोगाणुओं द्वारा कचरे से निकाले गए ऑक्सीजन की मांग वाले पदार्थों का 90 प्रतिशत है?

Answer 1

Answer:

The concept of time is self-evident. An hour consists of a certain number of minutes, a day of hours and a year of days. ... Time is represented through change, such as the circular motion of the moon around Earth. The passing of time is indeed closely connected to the concept of space.