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| 间断级配的 (常指混凝土中骨料); 松级配的; 开级配的 | |||
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| 开式级配的; 松级配的 | |||
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| 开级配的 | |||
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open graded : 31 phrases in 4 subjects |
| Bridge construction | 1 |
| Electronics | 1 |
| Hydroelectric power stations | 3 |
| Technology | 26 |
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