The forming of special section tubes with roll extrusion method is a new technology.
异型钢管滚挤成形是一种新技术。
Developing optimum cutting mechanism is a key technology for the design of special-section shield.
开发合理的切削机构是异形断面盾构的关键技术之一。
Developing optimum cutting mechanism is a key technology for the design of special-section shield.
开发合理的切削机构是异形断面盾构的关键技术之一。
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