A. 对细微表面裂纹灵敏度高 B. 检测工件温度较高时 C. 对近表面缺陷的检测灵敏度高 D. B和C
A. Please go to the next counter. B. You are not permitted to mail this abroad. C. Usually it takes about two weeks. D. It is not allowed to be mailed abroad.
A. 春 B. 夏 C. 秋 D. 冬
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