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| plane of mirror symmetry | |||
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镜面对称面 : 16 phrases in 9 subjects |
| Aviation | 2 |
| Bridge construction | 2 |
| Chemistry | 2 |
| Earth sciences | 1 |
| Engineering geology | 1 |
| General | 2 |
| Metallurgy | 2 |
| Technology | 2 |
| Textile industry | 2 |
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