Kev tsim cov khoom lag luam tshiab thiab kev daws teeb meem rau kev sib xyaw thiab tshuab mills thiab extruder siv hauv kev npaj roj hmab.
Kev tsim cov khoom lag luam tshiab thiab kev daws teeb meem rau kev sib xyaw thiab tshuab mills thiab extruder siv hauv kev npaj roj hmab.