... fixed at the lower end 下端固定 free at the upper end 上端自由 critical buckling load 临界屈曲载荷 ...
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free at the upper end
上端自由
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The essential components of tilt table device were two plates hinged together at one end. The upper plate, on which test sample was put, was continuously lifted at the free end till sample slided.
斜板仪主要构件为一端铰接在一起的两块平板，试验中顶升上平板自由端，直到试块在斜板上滑动，并读出斜板倾角。
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模块上移
模块下移
不移动