快速刨煤機(jī)...[繼續(xù)閱讀]

    cemented steel...[繼續(xù)閱讀]

    shuttle car...[繼續(xù)閱讀]

    calyx bit...[繼續(xù)閱讀]

    水平開拓...[繼續(xù)閱讀]

    雙平巷開采...[繼續(xù)閱讀]

    mining conditions...[繼續(xù)閱讀]

    geosyncline...[繼續(xù)閱讀]

    constitutional diagram...[繼續(xù)閱讀]

    剛體;剛性體...[繼續(xù)閱讀]