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【多选题】
外压壳体的结构特征不同，其（失稳）特征也各异。下列哪些特征符合受均布外压短圆筒的结构与失效特征（ ）。
A.
B.
C.
筒体失稳时呈现的规则波纹数大于 2 个波纹
D.
筒体结构表现为瘦长结构，筒体长度 L 不影响其失效特征及临界压力的大小
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