Đây là câu trả lời đã được xác thực
Câu trả lời được xác thực chứa thông tin chính xác và đáng tin cậy, được xác nhận hoặc trả lời bởi các chuyên gia, giáo viên hàng đầu của chúng tôi.
Giải thích các bước giải:
NaHS ko tác dụng với H2S.
FeSO4 + H2S ko có hiện tượng.
Vẻ đẹp của thế hệ trẻ việt nam thời kháng chiến chống mỹ cứu nước ta qua hai nhân vật anh thanh niên trong lặng lẽ sa pa và phương định trong những ngôi sao xa xôi Em đang cần gấp ạ nhờ mọi người giúp
ai giúp em vote 5sao cho nhanh ạ I. Choose the word which has a different stress pattern from the others. 1. A.charity B. reality C. quality D.density 2. A.curiosity B. personality C. community D. university 3. A.additive B.positive C.primitive D.possessive 4. A.nationality B.mobility C.equality D.majority 5. A.transitive B.effective C.positive D. sensitive II. Give the right word formation for these provided word 1. ____________waves are one of the great forces of nature. (tide) 2. Tsunamis, earthquakes and typhoons are ____________ disasters. (nature) 3. Our _______________ turns out to be correct. (predict) 4. The building was _______________ damaged by the fire.( extend) 5. The most __________ earthquake in Japanese history damaged Tokyo and Yokohama.(disaster) III. Complete each sentence with the correct word from the box. drought flood hurricane landslide tornado 1.When there is a _____________, a lot of water covers an area where the usually isn’t water. 2. A______________ refers to a long time without rain. 3. When there is _____________, a lot of rocks and earth fall down a hill. 4. A __________________ is a storm with a lot of wind that moves over water. 5. A__________________ is a storm in which the air moves very quickly in a circle. IV. Use a simple past or past perfect tense form. 1. The patient (die) before the doctor (arrive). 2. As the fire (break) out, people (hurry) out of their house. 3. I (meet) him yesterday. 4. I (recognize) him immediately as I (see) him before. 5. I wish I (stay) with my friend during his last days. V. Read the text then choose the best answer to fill in the blank. China said today that there was heavy loss of life in the earthquake which struck Tangshan City yesterday. Survivors said that Tangshan, an industrial city of one million people 160 kilometers east of Peking, was completely (1) _______________ Observers living in Beijing said it appeared that only a mall part of the one million inhabitants escaped (2) _______________ or injury. Many of the men of Tangshan were working in the (3) _______________ deep under the earth’s surface when the (4) _________ occurred. Unfortunately, few of these miners have (5) ………. 1. A. broken B. destroyed C. killed D. collapsed 2. A. death B. destruction C. disaster D. accident 3. A. roads B. ways C. fields D. mines 4. A. fall B. disaster C. loss D. collapse 5. A. existed B. rescued C. survived D. saved VI.Change into passive voice. 1 . Mary types letters in the office. 2. His father will help you tomorrow. 3. Science and technology have completely changed human life. 4. Peter broke this bottle. 5. They are learning English in the room.
What are your TV-watching habits? Tick (√) the right answer for you (you can tick more than one answer). ... How many hours a day do you watch TV? 1 hour 2-3 hours depends 2 How do you compare the time you spend watching TV to the time you spend on outdoor activities? more less the same 3 Do you watch TV when you are...? eating entertaining reading 4. What kind of programme do you watch most? educational entertaining sports 5 Do you leave your TV on when you are not watching it? never sometimes often
Một máy biến thế ở 2 cực cuộn sơ cấp của máy là 220V. Hiệu điện thế ở 2 đầu cuộn thứ cấp là 15400V. a) Hỏi máy biến thế với các cuộn dây có số vòng dây theo tỉ lệ như thế nào? b) Dùng một máy biến thế có cuộn sơ cấp 500 vòng để tăng hiệu điện thế ở trên. Hỏi số vòng dây của cuộn thứ cấp là bao nhiêu?
từ 1 điểm M ở ngoài đường tròn tâm O vẽ 2 tiếp tuyến MA.MB với đường trònA,B là hai tiếp điểm. trên dây AB lấy điểm H . Qua H kẻ đường thẳng vuông góc với OH cắt MA ở E , cắt MB ở F. a) Chứng minh tứ giác có 4 đỉnh O,H,A,E là tứ giác nội tiếp. b)Chứng minh tam giác OFE cân c)Kẻ OI vuông góc với AB.Chứng minh OI.OF=OB.OH
làm bài 11,12,13....dến 20 là được nhé
So sánh hai câu tục ngữ sau không thầy đố mày làm nên thầy không tày học bạn
Tại sao các tấm tôn lợp có dạng lượn sóng?
I. Choose the word which has a different stress pattern from the others. 1. A.charity B. reality C. quality D.density 2. A.curiosity B. personality C. community D. university 3. A.additive B.positive C.primitive D.possessive 4. A.nationality B.mobility C.equality D.majority 5. A.transitive B.effective C.positive D. sensitive II. Give the right word formation for these provided word 1. ____________waves are one of the great forces of nature. (tide) 2. Tsunamis, earthquakes and typhoons are ____________ disasters. (nature) 3. Our _______________ turns out to be correct. (predict) 4. The building was _______________ damaged by the fire.( extend) 5. The most __________ earthquake in Japanese history damaged Tokyo and Yokohama.(disaster) III. Complete each sentence with the correct word from the box. drought flood hurricane landslide tornado 1.When there is a _____________, a lot of water covers an area where the usually isn’t water. 2. A______________ refers to a long time without rain. 3. When there is _____________, a lot of rocks and earth fall down a hill. 4. A __________________ is a storm with a lot of wind that moves over water. 5. A__________________ is a storm in which the air moves very quickly in a circle. IV. Use a simple past or past perfect tense form. 1. The patient (die) before the doctor (arrive). 2. As the fire (break) out, people (hurry) out of their house. 3. I (meet) him yesterday. 4. I (recognize) him immediately as I (see) him before. 5. I wish I (stay) with my friend during his last days. V. Read the text then choose the best answer to fill in the blank. China said today that there was heavy loss of life in the earthquake which struck Tangshan City yesterday. Survivors said that Tangshan, an industrial city of one million people 160 kilometers east of Peking, was completely (1) _______________ Observers living in Beijing said it appeared that only a mall part of the one million inhabitants escaped (2) _______________ or injury. Many of the men of Tangshan were working in the (3) _______________ deep under the earth’s surface when the (4) _________ occurred. Unfortunately, few of these miners have (5) ………. 1. A. broken B. destroyed C. killed D. collapsed 2. A. death B. destruction C. disaster D. accident 3. A. roads B. ways C. fields D. mines 4. A. fall B. disaster C. loss D. collapse 5. A. existed B. rescued C. survived D. saved VI.Change into passive voice. 1 . Mary types letters in the office. 2. His father will help you tomorrow. 3. Science and technology have completely changed human life. 4. Peter broke this bottle. 5. They are learning English in the room.
Mng ơi cho em hỏi bài này làm sao ạ ?
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