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| 速度标志; 轮胎速度指数 | |||
| 速度指数 | |||
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speed index : 6 phrases in 5 subjects |
| Agriculture | 1 |
| Automobiles | 1 |
| Electric machinery | 2 |
| Hydroelectric power stations | 1 |
| Metallurgy | 1 |
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