Cho e hỏi ngu cái là trong hệ tọa độ ko gian Oxyz thì có đổi Vecto pháp tuyến thành chỉ phương như trong hệ Oxy đc ko ạ Tại e thấy ng ta tính ''Tích có hướng của cặp vecto'' . Ai giải thích giúp e cái đó với.

giúp mik với pls mình đà cần gấp lắm ạ !

Ex1:Choose the best answer. 1. He books for poor children for years A. has collected B. collects C. is collecting D. collected 2. Ngoc loves outdoors with trees and flowers. A. is B. be C. being D. was 3. _______ your homework yet? A. Are you doing B. Have you done C. Do you do D. Did you do 4. She _________________ this film already. A. am seeing B. have seen C. saw D. has seen 5. Nam Cao _______________ a lot of novels. A. has written B. writes C. wrote D. writing 6. Her mother _____________ three books. She is going to start the fourth one soon. A. has written B. writes C. wrote D. written 7. I think I ____________ him before. A. meet B. met C. have met D. meeting 8. Oh, yes! Now I remember. I ____________ him when I was in Hoi An. He was our guide! A. meet B. met C. have met D. will meet 9. I blood twice, and presents to sick children in the hospital recently. A. donate - give B. donated - gave C. have donated - have given D. have donated – gave 10.She blood twenty times so far. A. donates B. has donated C. is donating D. to donate 11.Let’s help the street children because they have bad . A. live B. living conditions C. ways of life D. earnings 12.They have decided to ride to work it is good for their health and the environment. A. so B. but C. although D. because 13. I’ve ________ seen this film. Let’s watch something else. A. never B. ever C. already D. yet 14. We can help to reduce ________ by using public transportation, biking and walking. A. air pollution B. water pollution C. social problems D. community service 15._______ do you do volunteer work? - Every weekend. A. How long B. How far C. How much D. How often Ex 2 : Choose the correct word A, B or C for each gap to complete the following passage. (1) January 17th, 1995, a powerful earthquake hit the city of Kobe, Japan. Many buildings (2) or collapsed. Soon after the earthquake, people in Kobe (3) working together to save their city. Neighbours pulled each other out (4) collapsed buildings. Ordinary people (5) out fires even before the fire trucks arrived. Volunteers in Kobe organized themselves into (6) . They worked out a system to send (7) to people who needed. Other teams searched for belongings in damaged stores and homes. Some people (8) food, water, clothes, and electric generators to different part of the city. Some volunteers took (9) of children who had lost their parents. Teams of volunteers from outside Japan helped, too. Today, Kobe has been built. But people there still remember the outpouring of support they (10) from all over the world back in 1995. 1. A. in B. at C. on D. from 2. A. is burning B. burned C. burning D. burn 3. A. to begin B. are beginning C. begin D. began 4. A. into B. of C. on D. with 5. A. to put B. putting C. puts D. put 6. A. teams B. pair C. group D. friends 7. A. helped B. helping C. help D. to help 8. A. brought B. bringing C. brings D. brought 9. A. part B. care C. caring D. note 10.A. received B. is receiving C. have received D. receiving

Giúp mk nhanh vs ạ.Mk đag cần gấp lắm Mk hứa sẽ đánh giá 5* cho Nhanh nhanh giúp mk nhé.Mk cảm ơn🙏🏻

Tại sao tên các triều đại phong kiến TQ không lấy theo họ vua

Cách xác định Số oxh trong hợp chất hữu cơ

tìm số có 3 chữ sô biết trung bình cộng của 3 chữ số bằng 6, chữ số hàng trăm gấp 3 lần chữ số hàng chục, chữ số hàng chục bằng 1/2 chữ số hàng đơn vị

Change these sentences into passive voice: 1, They are writing a book now ………………………………………………………………………………………………….. 2, We will buy a house tomorrow …………………………………………………………………………………………………. 3, He has cleaned the house. …………………………………………………………………………………………………. 4, My mother has had me wash the dishes. …………………………………………………………………………………………………. 5, It is necessary to finish this task by November. …………………………………………………………………………………………………. 6, They are making me buy a new car. …………………………………………………………………………………………………. 7, They don’t say that her family moved to another city. …………………………………………………………………………………………………. 8, Mary heard her father taking to his worker. …………………………………………………………………………………………………. 9, Can she develop the program better? …………………………………………………………………………………………………. 10, when did your father run a new restaurant? …………………………………………………………………………………………………. 11, They need to build the house by July. …………………………………………………………………………………………………. 12, It was essential to end the bad things coming to my life. …………………………………………………………………………………………………. 13, We used to meet him when we were living at that city. …………………………………………………………………………………………………. 14, She didn’t get me to talk with her son. ………………………………………………………………………………………………….

Có 3 hợp tử tiến hành nguyên phân - Hợp tử I nguyên phân 4 lần liên tiếp và đã sử dụng của môi trường 360 NST. - Hợp tử II tạo ra số TB con bằng 1 nửa số TB con của hợp tử I và trong các TB con đó có 192 NST - Hợp tử III nguyên phân 5 lần tạo ra các TB con có chứa 768 tậm động. Hãy xác định số NST 2n của mỗi hợp tử và nêu nhận xét.

Vẽ mầm NL : Tôi thích anh ấy, nhưng tôi không thể nói với anh ấy.