What are the correct statements about industrial grade?( )
A、Itreferstothelowestaveragegradeoforebodythatcanbeminedandutilizedunderthecurrenttechnicalandeconomicconditions
B、Withtheimprovementoftechnicallevel,theindustrialgradeisalsoimproved
C、Industrialgradeisalsocalledthehighestindustrialgrade
D、Itistheminimumcontentstandardoforeandwasterock
发布时间：2024-09-09 22:51:45
