A.及時(shí)清理 B.鉆進(jìn)捅開 C.不予理睬
A.上煤量降低 B.皮帶過載 C.皮帶打滑 D.皮帶有載時(shí)跑偏,無載時(shí)不跑偏
A.220 B.225 C.226 D.240