A. σ1愈接近平行于临空面，σ2则与之趋于正交
B. σ1愈接近平行于临空面，σ3则与之趋于正交
C. σ2愈接近平行于临空面，σ3则与之趋于正交
D. σ3愈接近平行于临空面，σ1则与之趋于正交
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