Mọi người giúp em với ạ Bằng phương pháp hoá học , hãy phân biệt các chất sau . Viết các phương trình hoá học đã dùng : a. Na2SO4 ; H2SO4 ; HCL. b.Na2CO3 ; Na2SO4 ; H2SO4 c. NaNO3 ; Na2SO4 ; NaOH d. H2S ; CO2 ; O2

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Hai xe khởi hành cùng lúc đi về phía nhau. Một xe đi từ A, một xe đi từ B. Sau 2 giờ 15 hai xe còn cách nhau 31km. Tính quãng đường AB, biết rằng xe thứ nhất đi cả quãng đường AB mất 4 giờ, xe thứ hai đi cả quãng đường BA mất 6giờ

3.trên đường thẳng d từ trái sang phải ta lấy các điểm A,D,C,B và lấy điểm O nằm ngoài đường thẳng d.Biết ^AOD = 30 độ ,^AOB = 120 độ. a, Tính số đo góc BOD b, Biết ^DOC = 2^BOC . Tính DOC và AOC

cho tia Iy nằm giữa hai tia Ix và Iz, yIz=30°, tính xIy

giúp mình ạ, cảm ơn ạ He said that some permanent stations were to be set up under the sea, and some undersea farms would provide food for the growing population of the world. The divers in both “houses” spent most of their time (7)______ the bottom of the sea. On four occasions, they went down to 360 feet and observed many extraordinary (8)______ of the marine life, some of which had never been seen before. During their stay, Commander Cousteau and his divers reached a depth of 1,000 feet and witnessed a gathering of an immense (9)______ of crabs which numbered, perhaps, hundreds of millions. They also found out that it was (10)______ to move rapidly in the water in a special vessel known as a “diving saucer” 7:A. exploring B. enquiring C. inquiring D. imploring 8:A. breeds B. forms C. castes D. systems 9:A. pack B. flock C. school D. herd 10:A. able B. hardly C. possible D. capable

Giải giúp mình với. Mình cần gấp ạ

Mn giúp em vs ạ em sắp nộp rồi ạ câu trả lời nào cụ thể nhất em sẽ vote 5*

EXERCISE: PHONETICES AND VOCABULARY I. PHONETICES Write the words from the box in the correct part of the table, according to the stress pattern. Examinee Interviewee Trainee Absence Devotee Committee Coffee Nominee Referee Trustee Refugee Expellee Addressee Jubilee Guarantee Divorce Payee Sudanese Burmese Lebanese Maltese Nepalese Congolese Japanese Vietnamese Chinese Senegalese Togolese Viennese Annamese Oo __________________________________________________________ OO __________________________________________________________ Ooo __________________________________________________________ OOo __________________________________________________________ OoO __________________________________________________________ __________________________________________________________ __________________________________________________________ __________________________________________________________ OooO __________________________________________________________ II. VOCABULARY: Fill in each blank of the passage with the words in thebox. A snack Open Gardens Start Stay Go to work Close Finish Life in Britain Homes: Most British people live in houses, not flats. Most houses have (1)__________. Daily life: Most office workers (2)_____________ at about nine o’clock in the morning and finish at about five or six in the evening. People don’t go home for lunch. People usually eat a big meal in the evening – they just have (3)___________ at lunchtime. School life: Children start school at about nine o’ clock and (4)___________ at about half past three. Most children have lunch at school. Children (5)___________ school when they are four or five years old and leave when they are sixteen or eighteen. Shops and restaurants: Shop (6)______________ at about nine o’clock in the morning and (7)____________ at about ten in the evening. Normally, they don’t close for lunch. Most shops open on Sunday, too. Many supermarkets (8)___________ open twenty-four hours, but most pubs and restaurants close at about eleven o’clock in the evening

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