双线区段由于列车单向运行，钢轨头部核伤常带有一定倾斜，应如何防止这类核伤漏检？
参考答案：
从大量探伤资料显示，双线区段由于列车单向运行，钢轨头部核伤常带有一定倾斜特点，为防止这类核伤漏检，应采用多个70°探头，以多个不同发射方向检测轨头。若使用2个70°探头检测时，应采用发射方向定期调换方式，通过调换70°探头方向，使声束方向与核伤反射面正交，以保证对不同倾斜核伤的检查。
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B: In my opinion (观点), 1 . A: I agree with you. But how can we keep healthy? B: I think 2 especially (尤其) green vegetables and fruit. A: Can we eat too much meat? B: No, I think 3 . A: What else should we do? B: We should 4 . But remember not to do sports soon after meals. A: I see. Is 5 for our health? B: It is good. Early to bed and early to rise makes you healthy. |