It was indicated that the linear defect appeared after machining is not crack, it is the appearance of oxide film involved in the casting under the effect of external force.
结果表明，这种加工后出现的线性缺陷并非裂纹，而是卷入铸件的氧化膜受外力作用后在叶片表面的显现。
By using XPS, before and after the intoxication of mixed oxide catalysts, the various appearance and the composition. valence and chemical mechanism of the active component of catalysts were studied.
运用XPS分析方法研究一系列复合氧化物催化剂中毒前后硫在其表面的各种形态及催化剂活性组分中毒前后的组成、价态、化学机理及其变化。
While extending the duration of corrosion sufficiently, the rate of corrosion was accelerated by the appearance of a large number of microscopic cracks on oxide surface.
随腐蚀反应的进一步进行，锆-4合金由于其表面形成大量微裂纹而出现加速腐蚀现象。
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