DrillingMachine相关论文
The working conditions of the MK-3 type full hydraulic tunnel drilling machine during the course of drilling were analyz......
API钻具数字螺纹接头具有使用寿命长等特点,因此在国外已经全面推广应用。但是由于种种原因,有一少部分API钻具数字螺纹接头在我国还没有推......