问题：
[单选题]铸铁压缩试验破坏由什么应力造成？破坏断面在什么方向？以下结论哪一个是正确的？ 正确答案是 。
A、切应力造成，破坏断面与轴线大致成45º方向；
B、切应力造成，破坏断面在横截面；
C、正应力造成，破坏断面在横截面；
D、正应力造成，破坏断面与轴线大致夹角成45º方向。
参考答案：
A
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