中国大学MOOC: Natural rubber usually is much stronger and harder than vulcanized rubber.
中国大学MOOC: Natural rubber usually is much stronger and harder than vulcanized rubber.
Natural rubber usually is much stronger and harder than vulcanized rubber. A: 正确 B: 错误
Natural rubber usually is much stronger and harder than vulcanized rubber. A: 正确 B: 错误
Old people are particularly ( ) members of our society. A: vulnerable B: vulgarity C: vulcanized D: vultures
Old people are particularly ( ) members of our society. A: vulnerable B: vulgarity C: vulcanized D: vultures
1