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weaken plane joint | |||
dummy joint | |||
groove joint; weakened plane joint |
半缝 : 34 phrases in 11 subjects |
Agriculture | 2 |
Architecture | 3 |
Hydroelectric power stations | 1 |
Metallurgy | 5 |
Oil / petroleum | 1 |
Plastic surgery | 1 |
Plastics | 1 |
Space | 1 |
Surgery | 1 |
Technology | 15 |
Textile industry | 3 |