1. Qhov sib piv ntawm qhov loj me ntawm cov khoom ua ntej tsoo rau qhov loj me ntawm cov khoom tom qab tsoo

i=Dmax/dmax (Dmax—-Qhov loj tshaj plaws ntawm cov khoom ua ntej tsoo, dmax—-qhov loj tshaj plaws ntawm cov khoom tom qab tsoo)

2. Qhov sib piv ntawm qhov dav ntawm qhov chaw pub ntawm lub crusher rau qhov dav ntawm qhov qhib tawm

i=0.85B/b (B—–Qhov dav ntawm qhov chaw pub khoom noj, b—–Qhov dav ntawm qhov qhib ntawm qhov chaw tso khoom noj, 0.85—-Xyuas kom meej tias qhov chaw zom khoom noj tom qhov dav ntawm cov khoom siv.)

Tus nqi ntawm qhov dav ntawm qhov qhib tawm: lub tshuab tso tawm ntxhib siv qhov dav tshaj plaws ntawm qhov qhib tawm; lub tshuab crusher nruab nrab siv qhov dav tsawg kawg nkaus ntawm qhov qhib tawm.

3. i=Dcp/dcp

(Dcp—qhov nruab nrab ntawm cov khoom ua ntej tsoo; dcp—qhov nruab nrab ntawm cov khoom tom qab tsoo)

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