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heap sand | |||
backing sand | |||
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backing sand |
填 充砂: 45 phrases in 10 subjects |
Architecture | 1 |
Electronics | 1 |
Engineering geology | 3 |
Explosives and Explosive Ordnance Disposal | 2 |
General | 1 |
Metallurgy | 2 |
Mining | 1 |
Oil / petroleum | 17 |
Rail transport | 1 |
Technology | 16 |