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| 硬磁材料 | |||
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| 永硬磁材料 | |||
| 硬磁材料 | |||
| 硬磁性材料; 永磁材料 | |||
| 硬磁性材料 | |||
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hard-magnetic material : 1 phrase in 1 subject |
| Technology | 1 |
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