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强度因数 |
strength factor : 26 phrases in 8 subjects |
Automobiles | 2 |
Aviation | 1 |
Bridge construction | 8 |
Explosives and Explosive Ordnance Disposal | 2 |
Hydroelectric power stations | 1 |
Metallurgy | 4 |
Nautical | 1 |
Technology | 7 |