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| grade of concrete | |||
| concrete class | |||
| class of concrete | |||
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| concrete grade | |||
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| concrete class | |||
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混凝土等级 : 13 phrases in 4 subjects |
| Bridge construction | 1 |
| Hydroelectric power stations | 5 |
| Rail transport | 1 |
| Technology | 6 |
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