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Bài tập khử không hoàn toàn Fe2O3 sau cho sản phẩm phản ứng với chất oxi hóa mạnh là HNO3 hoặc H2SO4 đặc nóng

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Bài tập khử không hoàn toàn Fe2O3 sau cho sản phẩm phản ứng với chất oxi hóa mạnh là HNO3 hoặc H2SO4 đặc nóng Câu 1: Cho một luồng khí CO đi qua ống sứ đựng m gam Fe2O3 nung nóng. Sau một thời gian thu được 10,44 gam chất rắn X gồm Fe, FeO, Fe2O3  và Fe3O4 . Hòa tan hết X […]

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Verse 46: In the very distant geological past, all animals were aquatic. The very first vertebrates or animals with backbones, of which we have any fossil record, lived in water. These vertebrates, the fish, were adapted to underwater living. Their streamlined bodies were covered with scales to reduce surface friction: they had muscular tails so that they could swim swiftly in such a dense medium as water; and they were endowed with gills for breathing underwater. Descendants of fish-type ancestors crossed the seashore barrier and accommodated themselves to life on land. As amphibians, they possess limbs instead of fins and lungs instead of gills. But they never became completely free of the bonds that tied them to the water; even today many amphibians return to the water to lay their eggs. Millions of years after the first clumsy amphibians crawled over the land, newer types of land dwellers appeared, these animals give rise to the present-day reptiles and mammals. They were completely converted for land dwelling, with bodies and biological activities far different from those of fish. With these special adaptations, mammals have been able to colonize the woods and meadows, the deserts and high mountains, often far removed from the sea. The passage suggests that the first amphibians used their limbs to……..

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Verse 46: In the very distant geological past, all animals were aquatic. The very first vertebrates or animals with backbones, of which we have any fossil record, lived in water. These vertebrates, the fish, were adapted to underwater living. Their streamlined bodies were covered with scales to reduce surface friction: they had muscular tails so […]

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Which of the following is an example of the 3rd form of cooperation as it is defined in the fourth paragraph?

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Thông tin: In the third type, called tertiary cooperation or accommodation, latent conflict underlies the shared work. The attitudes of the cooperating parties are  purely opportunistic: the organization is loose and fragile. Accommodation  involves common means to achieve antagonistic goals; it breaks down when the common means cease to aid each party in reaching its goals. Dịch nghĩa: Trong […]

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Lý thuyết phần sử dụng phương pháp đổi biến số để tính tích phân thi ĐGNL ĐHQG HN

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21/03/2022 by admin Để lại bình luận I. Một số công thức cần nhớ để đổi biến trong tích phân – Vi phân: (begin{array}{l}t = uleft( x right) Rightarrow dt = u’left( x right)dx\uleft( t right) = vleft( x right) Rightarrow u’left( t right)dt = v’left( x right)dxend{array}) – Công thức đổi biến: (intlimits_a^b {fleft[ […]

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Many Apple services collapsed on a large scale – LLODO

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Apple recently encountered a widespread problem when many services were down at the same time, including iCloud, App Store, Siri, iMessage, iTunes Store, Apple Maps, Apple Music, Podcasts, Arcade, Fitness+, Apple TV+, Find My, FaceTime, Notes, Stocks,… These are all services that have a large number of users around the world. The “collapse” of these […]

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The word ‘fragile’ in paragraph four is closest in meaning to ……….

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Câu hỏi: The word fragile in paragraph 4 is closest in meaning to ………. Lời giải tham khảo: Đáp án đúng: D Giải thích: Fragile (adj) = mỏng manh dễ vỡ Easily broken (adj) = dễ đổ vỡ Dịch nghĩa: The attitudes of the cooperating parties are purely opportunistic: the organization is loose and fragile. Dịch: Thái độ của các […]

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Verse 44: In the very distant geological past, all animals were aquatic. The very first vertebrates or animals with backbones, of which we have any fossil record, lived in water. These vertebrates, the fish, were adapted to underwater living. Their streamlined bodies were covered with scales to reduce surface friction: they had muscular tails so that they could swim swiftly in such a dense medium as water; and they were endowed with gills for breathing underwater. Descendants of fish-type ancestors crossed the seashore barrier and accommodated themselves to life on land. As amphibians, they possess limbs instead of fins and lungs instead of gills. But they never became completely free of the bonds that tied them to the water; even today many amphibians return to the water to lay their eggs. Millions of years after the first clumsy amphibians crawled over the land, newer types of land dwellers appeared, these animals give rise to the present-day reptiles and mammals. They were completely converted for land dwelling, with bodies and biological activities far different from those of fish. With these special adaptations, mammals have been able to colonize the woods and meadows, the deserts and high mountains, often far removed from the sea. An example of an amphibian’s incomplete adaptation to land life is…….

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Verse 44: In the very distant geological past, all animals were aquatic. The very first vertebrates or animals with backbones, of which we have any fossil record, lived in water. These vertebrates, the fish, were adapted to underwater living. Their streamlined bodies were covered with scales to reduce surface friction: they had muscular tails so […]

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