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running crack | |||
progressive crack |
扩展裂纹 : 75 phrases in 13 subjects |
Automobiles | 1 |
Aviation | 4 |
Chemistry | 1 |
Construction | 1 |
Electronics | 2 |
Explosives and Explosive Ordnance Disposal | 1 |
Metallurgy | 36 |
Oil / petroleum | 4 |
Plastics | 1 |
Polymers | 2 |
Space | 6 |
Steel production | 1 |
Technology | 15 |