不同直径的取土器对取样扰动的影响程度不同；
The disturbance of soil sample varies according to diameter of sampler.
而2根不同直径的棒也可以通过不同的连接器进行连接。
Finally, 2 rods of differing diameters can be connected to each other by means of various cross connectors.
目的：比较不同直径加压螺纹钉内固定股骨颈骨折的效果。
Objective: To evaluate the effect of compression screws with different diameters on fixation strength of femoral neck fracture.
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