We can distinguish the two from three aspects, as follows:
1.Different shape: the former has no ribs and each cross-section can be screwed, while the latter has ribs and the cross-sections cannot be screwed.
2.Different force: the former can only bear the force directly, while the latter can bear the force arbitrarily.
3. Different yield strength ratio : the yield strength ratio of the former is generally around 0.9, and the yield strength ratio of the latter is generally around 0.6.

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