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。
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。
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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