The characteristics of Longwall Shield?
A、morepowerfulandfaster/cuttingspeedsexceeding100fpm;
B、shieldmovementcanbeasignificantsourceofdust;
C、coaland/orrockfallfromthetopoftheshieldcanopydirectlyintotheairstream;
D、requiresshieldstoadvanceatafasterrate
发布时间：2025-06-14 07:22:00
