Nêu những lợi ích kinh tế mà biển và đại dương mang lại cho con người

Hidro hóa propin bằng lượng h2 dư với xúc tác là Pd/Pbco3 cho sản phẩm chính là :

A : propen

B : propan

C : metyletan

1. Nam didn't go to school last Tuesday
-> Nam was________________________

2. There is usually plenty of sunshine in southern countries
-> It is___________________________________________

3. We didn't enjoy the trip because of the heavy rain
-> The heavy rain prevented_________________

4. Hoa and Minh didn't go to school yesterday because of illness
-> Hoa and Minh were__________________________________

5. How wide is the stadium?
-> What____________

6. He enjoys playing chess
-> playing______

7. Are there building a statue of Chu Van An
-> Is_________________________________

8. Be careful or you'll hurt yourself
-> If you are___________________

9. You're the best guitarist in the school
-> No one________________________________

10. Because of a big storm, I stayed at home
-> Because___________________________________

giups mik vs ạ, mik cảm ơn