A.σ1=40MPa,ao=30° B.σ1=80MPa,ao=30° C.σ1=40MPa,ao=60° D.σ1=80MPa,ao=60°

A.σ1=40MPa,ao=30° B.σ1=80MPa,ao=30° C.σ1=40MPa,ao=60° D.σ1=80MPa,ao=60°

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