On these cranes, the hydraulic RAMS that extend to raise up the crane do not push on the boom, but instead on a pivoting link-bar.

这些起重机，液压冲力并不是作用于吊杆上，而是作用于一个铰链连接杆。

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The skylight is raised by two hydraulic rams. It has in-built sensors that prevent it from closing on obstructions, but that activate closure during sudden gusts of winds.

天窗由两只压力扬汲机控制启动，它有内置的传感器，防止因障碍物而关闭，但是当强风来袭时，会自行关闭。

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It's festooned with high pressure pipes and a set of intimidating hydraulic rams.

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Each of the software-controlled hydraulic rams can deliver a force of 20 tonnes, giving the rig the ability to mimic the effects of different types of train.

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The front and rear cabs (5) are steered by hydraulic rams and a drive unit links the two halves so the rear trailer can be steered independently and is not simply dragged behind the front unit.

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