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分类: 土木建筑类 (电网) 发布时间: 2023-11-03 08:53 浏览量: 1

A.σ1=40MPa,ao=30°

B.σ1=80MPa,ao=30°

C.σ1=40MPa,ao=60°

D.σ1=80MPa,ao=60°

正确答案是D