The black abstract material which sticks to inside crack of the sample machined by wire-electrode cutting is analyzed and studied by using scanning electron microscope and X-ray energy spectrometer.
应用扫描电镜及X射线能谱仪等设备，对采用线切割制取的裂纹样品内表面的黑色不明物进行了分析。
We thank you for your letter of July 18 enclosing a sample cutting of woolen material.
谢谢你方七月十八日内附毛料剪样的来信。
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