coating each time
每次涂敷
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Effects of volume percent of each component in oxidation solution, time and temperature of oxidation on thickness and tearing strength of blackened coating were studied.
研究了黑化液组分的体积分数、黑化处理时间及温度对黑化层厚度及撕裂强度的影响。
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