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| 时间标绘图 | |||
| 时间曲线图 | |||
| 时距曲线向量图 | |||
| time plot: 11 phrases in 5 subjects |
| General | 1 |
| Hydroelectric power stations | 1 |
| Metallurgy | 5 |
| Technology | 3 |
| United Nations | 1 |
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