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选择题：提高压杆稳定性的措施（ ） A.减小压杆长度L，或在压杆的中间增加支承。B.改善杆端约束，使长度系数μ值减小。C.选择合理的截面形状D.合理选用材料 答案：ABCD 提示：能阐述出解题过程的给予额外奖励，答案回复可见！
A.减小压杆长度L，或在压杆的中间增加支承。
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