Một lượng khí lí tưởng ở trạng thái ban đầu có áp suất 2atm ,nhiệt độ 27°C có thể tích 8 lít.người ta nén đẳng nhiệt cho thể tích giảm một nửa. A. Tính thể tích và áp suất cuối cùng của khí B.tính khối lượng riêng của khí ở cuối quá trình biết khối lượng riêng của khí ở điều kiện tiêu chuẩn là 1,29 km/m3 Giải giúp mình với.
IV. Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer for each of the blanks from 36 to 40 Have you ever seen a forest ……(36)…… by fire? A great forest fire is an awful thing to see. Once a fire started, it spreads….(37)……. Foresters say that late summer is the season when the fire is the ……….(38)…..danger to woods and forests. They are very dry then. Sometimes when the danger of fire is very great, foresters will not allow anyone to go into the forests. If people leave a camp-fire burning near a heap of leaves, this often causes a forest fire. Campers must always remember……….(39)…. out the camp-fire and cover the place with earth. It is the duty of every camper to take the greatest care not to start a forest fire. Anyone careless enough to start a forest fire has done something, ……(40)….. make life more difficult for all of us. Every fire destroys valuable wood, wildlife and good soil. Everyone of us must know how important it is to care for out great forest and save them from fire. 36. A. destroying B. destroyed C. destroy D. destruction 37. A. protectively B. quick C. quickly D. protective 38. A. greatest B. great C. greater D. good 39. A. puts B. putting C. put D. to put 40. A. who B. whom C. which D. whose
Một vật bắt đầu chuyển động dưới tác dụng của 2 lực đồng quy có phương vuông góc F1=3N F2=4N hãy xác định động lượng của vật ở thời điểm 2s Giúpp em vớii
Mn giup em voi giai trac nghiem thoi. Khong can loi giai
tính bài 7/8(1/4+2/5) giải bài toán trên
Gọi H là trực tâm của tam giác ABC. phương trình các cạnh và đường cao là AB: 7X-Y+4=0: BH: 2X+Y-4=O: AH: X-Y-2=0. Phương trình đường cao CH của tam giác ABC
Giúp mình giải bài tập này với các bạn, thank you
Viết lại câu đồng nghĩa It is prohibited to cross the road until the light goes green => You must...............................
Rewrite these sentences, using relative pronouns Tom was tired and wanted to stop. He had been driving all day. * Her book was published last year. It became a best seller. * What was the name of the year? Your son was born on that year. *
(extinct ,influence , eacefully , being destroyed ,environment,responsible ,captured ,pollutants , danger, off spring, captured , rapidly , nature , established , natural ) 1. Dinosaurs became _________________ millions of years ago. 2. Human beings are changing the __________________ in all aspects. 3. The chemical _______ from cars and factories make the air, water and soil dangerously dirty. 4. The earth will be a happy planet where human beings, animals and plants ____co-exist. 5. Animals shouldn’t be _______________ for recreation and entertainment. 6. Many species of rare animals are in __________________ of becoming extinct. 7. The place where animals are protected within their natural environment is called a _________. 8. Human beings have a great __________________ on our environment. 9. Many organizations have been set up and funds have been raised. “Set up”means _______________ 10. Wild animals should not be _____________ for recreation and entertainment. 11. The number of rare animals is decreasing _______________. 12. Human beings are ________________ for the changes in the environment. 13. National Parks are established to create the environment for rare animals to survive and produce _________________. 14. By cutting down trees, we are changing the __________________ habitat of birds and animals 15. All national parks are in danger of __________________.
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