trình bày tất cả các dạng hệ tuần hoàn ở động vật mấy chế chuyên sinh ơi giúp e với ạ

Câu 9: Cho 1,365 g một kim loại kiềm X tan hết trong dd HCl thu đ¬ược dd có khối l¬ượng lớn hơn dd HCl đã dùng là 1,33 g. Tìm tên X. Câu 10: Khi cho m (g) kim loại Canxi tác dụng hoàn toàn với 17,92 lit khí X2 (đktc) thì thu được 88,8g muối halogenua. a. Viết PTPƯ dạng tổng quát. b. Xác định công thức chất khí X2 đã dùng. c. Tính giá trị m. Câu 11: Để hoà tan hoàn toàn 8,1g một kim loại thuộc nhóm IIIA cần dùng 450 ml dung dịch HCl 2,0M, thu được dung dịch A và V lit khí H2 (đktc). a. Xác định nguyên tử khối của kim loại trên, cho biết tên của kim loại đó. b. Tính giá trị V. c. Tính nồng độ mol của dung dịch A, xem như thể tích dung dịch thay đổi không đáng kể.

Một máy hoạt động với công suất 1,2kW để nâng vật lên cao 10m. Hỏi thời gian để nâng vật lên là bao nhiêu? Biết vật có khối lượng 90Kg và hiệu suất của máy là 75%

(-75).(-27).x vàx=4 Giải dùm mình

Rewrite the following sentences, using the provided word keep meaning as that ofthe rootone. 33. The garden still needs digging. The garden hasn’t been dug 34.Nobody can deny that she has a beautiful voice. It can’t be denied that she has a beautiful voice 35.She and I have never been there before. Neither 36. England no longer had dreadful fogs. There used to .................................................................................................... Completethesecondsentencesothatithasasimilarmeaningtothefirstsentence,using the word incapital 37. She spoke so fast that nobody understood her.( DID) So.................................................................................................... 38. Although my parents are busy at work, they try to find time for their children. ( AS) Busy.................................................................................................... 39. My father couldn't go to my sister's wedding party. He was so ill. ( SO….THAT) My father.................................................................................................... 40. The agreement ended six-month negotiation. It was signed yesterday. ( WHICH) The agreement....................................................................................................

VI.Read the passage and choose the correct answers (A,B,C or D) to fill in the blanks. ROOMMATE WANTED My name is Michael and I study at East Bay College.I’m currently looking for a fellow student to (34)____ a samll apartment.There are too bedrooms and one bathroom.There (35)_____ one twin bed and one dresser in each room.The living room (36) ______ the kitchen are fully furnished.The apartment is within walking distance of East Bay College’s campus and next to a coffee shop. There is also a food store nearby.Roommate is expected (37) ______ half of the rent and utilities.If you’re interested please contact me (38)_________ the information below. 34. A. buy B. sell C. rent D. share 35. A. are B. is C. were D. was 36. A. but B. and C. or D. without 37. A. covered B. cover C. to cover D. covering 38. A. by B. via C. in D. with

1 vườn hoa có chiều dài hơn chiều rộng 20m , chiều dài gấp đôi chiều rộng. tính chu vi và diện tích cua mảnh vườn

Giúp mik câu 4. Mik sẽ vote cho

Giúp mình câu 2 và câu 3 phần 2 với.Mình cảm ơn(câu 3 các bạn có thể gạch ý)

Read the following passage and mark the letter A, B, C or D to indicate the correct answer to each of thequestions. Last year, we had a nice holiday. My friend and I went to the seaside for a month. I had been to the seaside several times before, but this was the first time for my friend. Naturally, it was the great event for him. Finally, the day came. It was a fine morning. We got up very early because we wanted to leave home after breakfast. We made the journey by car. We reached the seaside at noon. We spent many hours on the beach. We enjoyed making castles and channels in the sand. People said we ought to spend at least a few weeks at the seaside. If we could stay longer, so much the better. 27. How long did the writer and his friend spend at the seaside? A. week B. A few weeks C. A month D. A few months 28. Who went to the seaside the first time A. The writer B. The writer and his friend. C. The writer. D. The writer’s friend 29. What was the weather like on the day they started their journey to the seaside? A. It was bad B. It was rainy C. It was snowy D. It was nice. 30. How did they travel to the seaside? A. By car B. By train C. By bus D. By air 31. When did they reach the seaside? A. At 8 o’clock B. At 12 o’clock C. At 4 p.m D. At 9 p.m