HOC24
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B. 3,136l
A. CaCO3 + H2SO4 -------> CaSO4 + CO2 + H2OB. COH12O6 ---lên men----> C2H5OH + CO2 C. C2H5OH + O2 -----------> CO2 + H2OD. Cu + H2SO4 -----------> CuSO4 + SO2 + H2O
trees should be planted around the shool yard
1. doesn't she2. did he3. won't they4. can't she5. do they6. didn't he7. won't we8. don't you9. do you 10. am not11. doesn't she12. isn't he13. haven't they14. hasn't it15. wasn't she16. aren't they17. may she18. are you19. have you20. isn't it
1. craft2. because of3. variety4. how5. carved