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Tranngoc
2 năm trước
Một thanh đồng chứa 2mol Cu, trong thanh đồng có 2loại đồng vị là 63 29Cu và 65 29Cu với hàm lượng tương ứng là 25% với 75%. Hỏi thanh đồng đó nặng bao nhiêu gam
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I- Supply the correct form of the verb in parentheses in order to make present probably conditions : 1. If I ( find ).......... the book , I ( give )........ it to you . 2. He ( get ).......... a raise If he ( work )........ hard . 3. If Quang ( call )..........., I ( talk )....... with him . 4. You ( be )......... able to go on a vacation If you ( save )........... your money . 5. They ( not / have ).............. any accidents If they ( drive )..........slowly . 6. If I ( have )..........time, I ( do )............my homework . 7. Lan ( go) ..............to school in time If she (get) .............up early . 8. If Tan (study)............Maths well , he (get)............good marks . 9. They ( not/ injure ).............If they ( not/ drive )..............too fast . 10. If The weather ( be ) ............fine, We ( walk ).............in the park . 12. If It ( shine)............., I ( go ) ..........out with my friend . 14. If it ( not / rain)............., we ( eat)......dinner outside 16. If Hoa ( do ).............homework quickly , she ( sleep )........... early . 18. He ( help )............... her If she ( need)........ 19. If my mother ( be ) .......busy , I ( clean ) .............. the floor carefully.

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