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back timbering
词语: back timbering
解释: 顶板支护
词性: 名词
词典: 地质专业英汉词典
back timbering 相关解释
back timbering 〔名词〕顶板支护
顶板支护 back timbering;roof support;roof timbering
顶板支护 back timbering
顶板支护 roof support