4~8m厚急倾斜煤层放顶煤开采架后清煤装置方案设计
4~8m후급경사매층방정매개채가후청매장치방안설계
Projection Design of Support-back Sweeping Coal Device in Full-mechanized Caving Mining 4 ~ 8m Steeply Inclined Coal-seam
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