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【单选题】
图示某单元体的主应力为σ1、σ2、 σ3，则其最大剪应力为 。【图片】A.
τ max ＝（ σ 1 －σ 2 ） /2 ；
B.
τ max ＝（ σ 2 －σ 3 ） /2 ；
C.
τ max ＝（ σ 1 －σ 3 ） /2 ；
D.
τ max ＝ σ 1/2 。
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