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【单选题】
单元体斜截面上的正应力与切应力的关系中 ( ) 。 A . 正应力最小的面上切应力必为零 ; B. C . D.A.
正应力最小的面上切应力必为零 ；
B.
最大切应力面上的 正应力必为零 ；
C.
正应力最大的面上切应力也最大 ；
D.
最大切应力面上的正应力却最小 。
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