- Ghép 4 bộ song song.

\( \Rightarrow E_{b}=E_1=2(V)\)

\(r_b=\dfrac{r}{4}=0,5 (Ω)\).

- Do sự co thắt từng đợi của môn vị, môn vị này chỉ mở khi có sự chênh lệch nồng độ. Sự co thắt từng đợt này giúp cho thức ăn xuống ruột từng đợt làm tăng hiệu suất tiêu hoá thức ăn nêu xuống ruột ào ạt thức ăn sẽ không thấp đều, các enzim ruột ngoài ra ruột nhỏ có thể làm tổn thương ruột.

Gọi độ dài cạnh của hình vuông là \(a (a >0)\)

Theo đề bài : \(S_{hv}=S_{hcn} \Leftrightarrow a^2=8.18 \Rightarrow a=12 (TM)\)

Vậy độ dài cạnh của hình vuông là \(12m\).

- Dựa vào kinh độ và vĩ độ.

- Động từ: cầu hôn, ở, có, vẫy tay, nổi cồn bãi, mọc lên, gọi, hô, về, là, làm.

Our teachers have explained the English grammar.

The English grammar has been explained by our teachers.

Some drunk drivers caused the accident in this city.

The accident was caused by some drunk drivers.

Tom will visit his parents next month.

Tom's parents will be visited by Tom next month.

How many languages do they speak in Cannada?

How many languages are spoken in Canada?

Some people will interview the new president on TV.

The new president will be interviewed on TV.

The German didn't build this factory during the Second World War.

This factory wasn't built by the German during the Second World War

Did Mary buy this beautiful dress?

Was this beautiful dress bought by Mary ?

1. didn't want - had already seen

2. did - wrote

3. had gone

4. had broken

5. took - had read

6. remembered - had asked - phoned

7. went - knocked - wasn't - had gone - didn't want

8. had never used - didn't know

9. had lived- moved

10. waked - had already been

11. got - had worked

12. had picked - went

13. told - had served

14. went

15.was - performed

16. admitted - had broken

17. hadn't you done - came

18. felt - didn't prepare

19. Had Peter come - finished

20. had finished - went

When did tom buy that dictionary?

→ How long has Tom bought that dictionary ?

My father started giving up smoking last year.

→ My father has given up smoking since last year.

I haven't met Lan for a long time.

→ We last met a long time ago.