extremely significantP<0 . 01
As can be seen from Table 4 , The influence of seed-seed rolling friction coefficient and seed-steel rolling friction coefficient on the angle of repose in simulation experiment is extremely significant (P<0 . 01) .
As can be seen from Table 4 , The influence of seed-seed rolling friction coefficient and seed-steel rolling friction coefficient on the angle of repose in simulation experiment is extremely significant (P<0 . 01) .