2 bình trụ thẳng đứng, có tiết diện 10 cm2 và 30  cm2 có đáy thông với nhau bằng 1ống nằm ngang, có tiết diện không đáng kể a/Người ta rót vào bình lớn 160g nước . Tính áp suất ở đáy mỗi bình  b/Sau đó, người ta rót vào ống nhỏ 100  cm3 dầu . Tính độ tăng, độ giảm của mức nước trong mỗi bình

Nhà bạn An cách trường 4km . Hôm nay , bạn An đi từ nhà đến trường sau khi đi được 1/4 quãng đường thì chợt nhớ mình quên một quyển sách nên vội trở về và đi ngay đến trường thi trễ mất 12 phút

a Tính vận tốc chuyển động của e hs này  .Bỏ qua tg lên xuống xe khi về nhà

b Để đến trường đứng như tg dự định thì quay về lần 2 , em phải đi với vận tốc bn?

giúp mik v

Tell me your reason for choosing to live in the country ( why)

1.    Last night I (read) _________________ when suddenly I (hear) _______________ a shout.

2.    The postman (come) __________________ while I (have) __________________ lunch.

3.    When we (go) _________________ out, it (rain) _________________.

4.    (you / watch) ___________________ TV when I (phone) _______________ you?

5.    We (meet) ______ Ann at the party yesterday, she (wear) ______ a lovely white dress.

6.    The boys (break) ____________ the window while they (play) ______________ football.

7.    I was home late, but my friends (wait) ____________ when I (arrive) ________________.

8.    He said that he (not drive) ______ fast when the accident (happen) _________________.

9.    Tom (fall) _____________ off the ladder while he (paint) _________________ the ceiling.

10. What (you / do) _________________________ at this time yesterday?

11. The door bell (ring) ____________while Tom (watch) ______________-TV.

12. How fast ________you (drive) __________when the accident (happen)_______________?

13. Ann and Susan (make) ___________dinner when Martin __________________(arrive).

14. The light (go) ________out while we (have) __________dinner. But it (come) _________ on again after ten minutes.

15. What_______ you (do) _______at this time yesterday? - I (work) _______on the computer.

16. It suddenly (begin) ___________to rain while Laura (sit) _____________in the garden.

17. Sam (take)______________a photo of me while I (not/ look)________________--.

18. When I (see) __________them, they (try) __________to find a new house near their work.

19. I (walk) __________along street when I suddenly (feel) _________something hit me in the back. I (not/know) ______________________what it was.

20. Last night I (drop) ___________a plate when I (do) ____________the washing up. Fortunately I (not/ break)___________________.

When Andrew arrived at the airport, he (1. look) _____________ around but he couldn’t see anybody there to meet him. A lot of people in uniforms (2. hold) _____________ cards with names on them, but they (3. not wait) _____________ for him. It was a beautiful sunny day and he decided to go to the hotel on his own. He (4. go) ___________ out of the airport and looked for a taxi. A lot of people (5. wait) ____________, so he decided to get the airport bus into Paris. The bus (6. stop) _____________ in the city center, quite near his hotel and he got off. When he (7. walk) _____________ towards his hotel with his case, a car suddenly stopped next to him. A woman got out. She (8. wear) _______________ a uniform and (9. carry) _______________ a card which said “Mr. Andrew Jones”. “Mr. Jones”, she said, “I (10. wait) _______________ for you at the airport but you didn’t see me.”

1.  Most ethnic groups live in rural areas, growing rice and practising slash-and-burn farm.

2.  The Muong people are the ethnic minority who live in the mountainous regions of Vietnam.

3.  We have recently visited some of the remote communities in the north highlands.

4.  Youth Ngai women did not receive the inheritance after their parents died.

5.  The Ta Oi managed preserving their proverbs, folk songs, and stories.

6.  Another typical musical instrument of the Raglai is the flat gong called Ma La.

7.  I want to visit the Vietnam Museum of Ethnology to learn for 54 ethnic minority groups.

8.  Xo Dang men are good at architecture, sculpting, and paint.

9.  Co Tu people love to share with guests about their live and tradition.

10. Do you know that an average person check Facebook over30 hours a week?

11. We’ve listed lots of better things to do instead of watch TV.

12. The clothing of one group is quite differently from that of other groups.

13. When you play game online, be careful when you make friends to strangers.

14. She goes to the dance club with her friends every evening Sunday.

15. Han lives in an cottage house in Cuc Phuong national park.

16. Playing team sports gives you much fun than individual sports.

17. They found the games more difficulty to win than they had expected.

18. Wonderful family days out are some of most special memories

1 Các cách viết sau trong hoá học lần lượt chỉ ý gì? Cl, 2O₂, Br_2,  2NaCl, Al(NO₃)₃

2. Công thức hóa học của axit sunfuric là H₂SO₄ cho em biết những gì về chất đó

1. Rita plays the violin __________ (good /well)

2. He sometimes has an accident because he drives too _________ (fast / fastly).

3. Miss White sings very _______ (beautiful / beautifully).

4. Robert is ___________ (terrible / terribly) upset about losing his job.

5. Nam works very ____________ (hard / hardly).

VIII. Change these Adjectives into Adverbs, make Comparison of Adverbs and then rewrite:

1. My sister often works (hard)  ………………………. than me.

-> I ............................................................................................................

2. They play football (skillful) ………………….……. than us.

-> We ........................................................................................................

3. Peter drives (careful) ………………………. than Tom.

-> Tom ......................................................................................................

4. She does morning exercise (frequent) ………………………. than me.

-> I ............................................................................................................

5. My mother cooks (good) ………………………. than my father.

-> My father ..............................................................................................

6. I get up (early) ………………………. than my brother.

-> My brother ............................................................................................

7. Mai speaks English (bad) ………………………. than Hoa.

-> Hoa .......................................................................................................

Phân tử chất B do 2 nguyên  tố C, H tạo  nên và nặng bằng phân tử nitơ.  Biết  trong 1 phân  tử chất  B tỷ  lệ  số  nguyên  tử  C và số nguyên tử H  bằng 1:2. Hãy  xác  định công  thức  hoá  học  của B