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roof jack

  • 顶板螺旋千斤顶

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  顶板螺旋千斤顶

... 顶板裂缝 foig; 顶板螺旋千斤顶 roof jack; 顶板落石 scalings; ...

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权威例句

  • This was unsustainable even before silver prices went through the roof, says Jack McCall of AMSC (formerly American Superconductor), the world's biggest producer of HTS wires.

    ECONOMIST: Inside story

  • Earlier Wednesday, a fifth hole drilled down into the mine found just six inches of open space left between the roof and rubble in an 8-foot-high tunnel, said Jack Kuzar, a district manager with the federal Mine Safety and Health Administration.

    CNN: Crews prepare for final rescue effort at Utah mine

  • Westwood was only able to parry Jack Colback's low drive, with Fallon on hand to fire the loose ball into the roof of the net.

    BBC: Sport - Football - Coventry 1-1 Ipswich

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