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| bottom course concrete | |||
| blinding concrete | |||
| concrete cushion | |||
| concrete bed; concrete mat (tress); concrete pad; concrete sub-slab; mud slab; leveling concrete | |||
| |||
| mattress | |||
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混凝土 垫层 : 22 phrases in 4 subjects |
| Architecture | 3 |
| Bridge construction | 3 |
| Engineering geology | 1 |
| Technology | 15 |
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