Nêu các nguyên nhân làm bóng đèn không sáng khi mắc nó vào cạnh mạch điện có nguồn điện ?
Hòa tan một muối cacbonat kim loại M bằng môt jluowngj vừa đủ dd H2SO4 9,8% ta thu được dd muối có nồng độ % bằng 14,18%.xác định công thức muối cacbonat đó
Thả một quả cầu bằng nhôm khối lượng 210 g được đun nóng tới 142°C vào một cốc đựng 244g nước ở 20°C, biết nhiệt độ khi có sự cân bằng nhiệt là 42°C. Tính nhiệt dung riêng của nhôm. Biết nhiệt dung riêng của nước là 4200J/kg.K. a. Vật nào thu nhiệt, vật nào tỏa nhiệt b. Tinh nhiệt dung riêng của nhôm
Câu 2: Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that best combines each pair of sentences in the following questions. I’m so excited. I’m going on vacation with my family tomorrow. A.I’m so excited because I can’t go on vacation with my family tomorrow. B.I’m so excited so I can go on vacation with my family tomorrow. C.I’m excited that I’m going on vacation with my family tomorrow. D.I’m not excited that I’m going on vacation with my family tomorrow. Câu 3: Read the following passageand mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. When you hear how I learned a foreign language, you have to remember a few things. In 1993, when I started learning English, no one had heard of the Internet. I wasn’t able to read websites on topics that I found interesting or follow blogs. And I have no idea how I decided which movies to see without my favourite movie review website. My reading practice was limited. All I had were a few books on sale locally. For listening practice, I only had the news and cartoons on cable TV. People bought and rented videos but in Poland there was no spoken English on them. The only way to hear that was to visit the movies. My dictionaries were all in book form until I received my first PC dictionary. It came on at least six disks and had unhelpful explanations and few example sentences. It doesn’t sound very useful but I loved it because of its ability to work with other programs and find English words more quickly. Today, computerized dictionaries have simple explanations and lots of examples. Now I can spend hours on the web, reading about my favourite topics, downloading up-to-date movies, emailing English-speaking friends and posting comments on forums. The writer liked his first computer dictionary because it ____________________. A.came with other computer programs B.was better than today’s dictionaries C.found information at a faster speed D.gave you useful example sentences Câu 4: Read the following passageand mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the questions. When you hear how I learned a foreign language, you have to remember a few things. In 1993, when I started learning English, no one had heard of the Internet. I wasn’t able to read websites on topics that I found interesting or follow blogs. And I have no idea how I decided which movies to see without my favourite movie review website. My reading practice was limited. All I had were a few books on sale locally. For listening practice, I only had the news and cartoons on cable TV. People bought and rented videos but in Poland there was no spoken English on them. The only way to hear that was to visit the movies. My dictionaries were all in book form until I received my first PC dictionary. It came on at least six disks and had unhelpful explanations and few example sentences. It doesn’t sound very useful but I loved it because of its ability to work with other programs and find English words more quickly. Today, computerized dictionaries have simple explanations and lots of examples. Now I can spend hours on the web, reading about my favourite topics, downloading up-to-date movies, emailing English-speaking friends and posting comments on forums. To watch films in English, Polish people in the 1990s had to ____________________. A.have cable television B.rent films on videotape C.watch TV for children D.go to the cinema
cảm nhân về 2 câu thơ sau :'' tháng ngày bao quản thân sành sỏi . mưa nắng càng bền dạ sắt son''
So sánh chiều dòng điện theo quy ước với dòng điện trong kim loại ?
Cho ΔABC cân tại A và tam giác đêu BCD(D và A nằm khác phía đối với BC ) . Tính góc BDA?
chứng tỏ tổng các phân số sau nhỏ hơn 3 : B = 21/11 + 19/30 + 11/36
Tính diện tích xung quanh diện tích toàn phần thể tích hình lập phương có cạnh là a)3dm. b)2,9m. c)4/5m
Vẽ tranh đề tài covid 19 ko chép mạng
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