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| flux type (【技】一般来说，保护渣分为四种基本类型：粉状保护渣、颗粒保护渣、预熔型保护渣和发热型保护渣。); powder type | |||
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保护渣类型 : 5 phrases in 1 subject |
| Metallurgy | 5 |
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