What do you mean by material balance equation?

1.	What do you mean by material balance equation?
A.	Original-Solids-in-place (OSIP)
B.	Original-Gas-in-place (OGIP)
C.	Original-Air-in-place (OAIP)
D.	Original-Liquid-in-place (OLIP)
Answer» E.

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What do you mean by material balance equation?
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What do you mean by material balance equation?

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