1. Oke nke oke oke nke ihe ahụ tupu a gwepịa ya ruo oke oke nke ngwaahịa ahụ mgbe a gwepịachara ya

i=Dmax/dmax (Dmax—- Oke oke oke nke ihe ahụ tupu a gwepịa ya, dmax—-oke oke oke nke ngwaahịa ahụ mgbe a gwepịachara ya)

2. Oke nke obosara dị irè nke ọdụ nri nke igwe ihe na-egweri ihe na obosara nke oghere mwepụta

i=0.85B/b (B—–Obosara ọdụ ụgbọ mmiri nri Crusher, b—–Obosara oghere mwepụta Crusher, 0.85—-Hụ na igwe nkụcha ahụ na-ata obosara dị irè nke ihe ahụ.)

Uru nke obosara nke oghere mwepụta: igwe mwepụta siri ike na-ewe obosara oghere mwepụta kachasị elu; igwe nkụcha etiti na-ewe obosara oghere mwepụta kacha nta.

3. i=Dcp/dcp

(Dcp—dayameta nkezi nke ihe ahụ tupu a gwepịa ya; dcp—dayameta nkezi nke ihe ahụ mgbe a gwepịachara ya)

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