单选：有表面裂纹所产生的磁痕，其特征一般（）A．大而不清晰B．宽阔、无明显的边缘C．明显、清晰D．A和B

题目分类：智能楼宇管理师考试
题目类型：单选
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题目内容：

有表面裂纹所产生的磁痕，其特征一般（）
A．大而不清晰
B．宽阔、无明显的边缘
C．明显、清晰
D．A和B

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