protection method meaning in English

保护法

A special protection method for underground drainage pipeline
地下排水管道的特殊保护方法
Leakage causes and protection methods of piping for calcium nitrate salt water
直硝盐水管系泄漏原因及对策
An easy protection method before the hard anodizing was developed
试验表明，硬质阳极氧化后铬酸阳极化膜层的耐蚀性能良好。
Discussion on metal corrosion of hot water heating of pipe network and protection methods
试论热水供热管网的金属腐蚀与防护方法
Improvement in hyperbranched polyglycidol hydroxyl groups ' conversion by protection method
保护法提高超支化聚缩水甘油的羟基反应率

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