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| 电气触点材料 | |||
| 电接点材料; 电接触器材 | |||
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| 电接触材料 | |||
| 触头材料 | |||
| 电气触点材料 | |||
| 电极材料 | |||
| 电接点材料; 电接触器材 | |||
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electrical contact material : 2 phrases in 2 subjects |
| Metallurgy | 1 |
| Technology | 1 |
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