；万向联轴节 hook-load capacity 大钩最大设计荷载 hook-up for cementing 注水泥装置 ..
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The safety bearing capacity test shows that, the upper portion of the derrick is an area loaded heavily, and the measured stress on the derrick stand is linear to the hook load.
由井架安全承载试验结果可知：井架上段为受力较大部位；井架立柱测试应力与大钩作用载荷呈线性关系。
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