题目：
磨削裂纹的磁痕一般垂直于磨削方向，呈平行线状或网状，有时还呈现出龟裂状。
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
磨削裂纹的磁痕一般垂直于磨削方向，呈平行线状或网状，有时还呈现出龟裂状。
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