掘进康拜因
continuous heading machine
掘进机掘进
tunneling of heading machine
掘进机技术
TBM construction technique
掘进机回转架
whirling stand of boring machine
掘进机焊接工艺
the welding process of the tunneling-machine
掘进机法
tunnel boring machine TMB method
method of TBM
掘进机(TBM)
coal mine area in the western China