conveyer reverse cover 输送机回动盖
left conveyor reverse cover 左侧输送机回动盖
reverse lever catch cover 回动杆挡盖
reverse coagulation cover method 逆凝聚包覆法
reverse-coagulation cover method 逆凝聚包覆法
Cut and cover reverse method 盖挖逆作法
cover-excavation reverse method 盖挖逆作法
cover-and cut reverse construction method 盖挖逆作法
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