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| 牺牲阳极保护 | |||
| 电镀保护法; 牺牲涂层式防护 | |||
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| 牺牲阳极腐蚀防护; 锌置换防蚀保护; 牺牲阳极腐蚀保护 | |||
| sacrificial protection: 3 phrases in 2 subjects |
| Oil / petroleum | 2 |
| Technology | 1 |
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