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quocvuong
2 năm trước
xét nguyên tử hidro theo mẫu nguyên tử Bo. Electron trong nguyên tử chuyển từ quỹ đạo dừng m1 về quỹ đạo dừng m2 thì bán kính giảm 27ro, đồng thời động năng của electron tăng thêm 300%. bán kính của quỹ đạo dừng m1 có giá trị gần nhất?
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1. Reorder the words to make meaningful sentences 1. wonderful/ in/ We/ time/ are/ hanoi/ a/ having/./ -............................................................................................ 2. Vietnam/ of/ is/ one/ the/ It/ popular/ most/ tourist attractions/ -................................................................................ 3. from/ vacation/ come/ since/ I/ not have/ last week/ a/ back/ in/ -................................................................................ 4. Hoi An/ famous/ old/ houses/ buildings/ and is/ for/ and/ traditional crafts/?/ -................................................................................? 5. people/ live/ Will/ on the Moon/ someday? -.....................................................................................? 6. Hanoi/ interesting/,/ and/ is/ a/ city/ it/ large/ is/ also/ is/./ .......................................................................................... 7. good/ the/ there/ Let's/ and/ time/ beach/ go/have/ to/a/./ .............................................................................................. 8. come/the party/ tonight/will/to/, because/I/ not/I/am/busy/./ ............................................................................................ 9. Minh/ been/ hasn't/ since/ 2017/ to/ Ha Noi/./ ............................................................................................. 10. world/ seven/ in/ are/ continents/ There/ the/./ ............................................................................................. cacs bạn giúp mik với

1. My school (have)........................two floors. 2 She (drink)...........................a lot of juice every day. ->................................................................................................... 3. Lan and Nga (see)....................................a new film next week. ->................................................................................................... 4. What about (visit).........................................our parents? 5. He (ride).................his bicycle every day. He (ride)..................his bicycle now ->................................................................................................... III. READING: Read the following passage and then do the tasks that follow. (2pts) South Vietnam enjoys a tropical climate, so there are two seasons all year round. They are known as the dry season and the rainy season. It's very hot in the dry season, but it's cool in the rainy season. In the dry season, we often go camping and swimming. In the rainy season we don't often go out. We sometimes go fishing in the morning because it often rains in the afternoon. A. Tick True or False. FACTS T F 1. There are two seasons in the south of Vietnam. 2. It’s very cold in the dry season. 3. They often go camping and swimming. 4. in the rainy season, it often rains in the afternoon. B. Answer the following sentences. (1pt) 1. How many seasons are there in South Vietnam? ................................................................................................................ 2. What do they do in the rainy season? ................................................................................................................ 3. Is it cool in the dry season? ............................................................................................................... 4. Why do they go fishing in the morning? .................................................................................................................... IV. WRITING: Write complete sentences using the suggested words. (2pts) 1. Ba/ always/ walk/ school. ...................................................................................................................... 2. The Mekong River/ long/ than/ the Red River. .....................................................................................................................? 3. Ho Chi Minh City/ large/ than/ Hanoi. ...................................................................................................................... 4. How/ rice/ and/ many/ vegetables/ he/ produce? ......................................................................................................................

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