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nly682828
2 năm trước
Mn giúp tui làm bài nha, ko cần giải thích j cho mệt hết á, k/ quả đúng là đc😑😑
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The seasonal movement of animals, especially of birds, fish and some mammals such as porpoises, is still not (11)................... understood. Climatic conditions are thought to trigger off migration where perhaps lower temperatures (12)................. in less food being available. Some animals, particularly (13) .................., travel vast distances. Golden Plovers are just one example, as they annually fly 8000 miles from the Arctic to South America. Migrating animals (14)................ to use three mechanisms for finding their way. Over short distances an animal moves to successive familiar landmarks and this is called piloting. In orientation, a straight line path is taken, (15)................. on the animal adopting a particular compass direction. Navigation is the most complex process as the animal must first (16)................. its present position before taking a direction relative to that. It seems that some birds (17).................. the sun, stars (often the North star which moves very little), and an ‘internal clock’ which (18)..................... allowances for the relative position of these heavenly (19).................. Even when the sun is hidden behind a cloud, many birds are (20)................... to continue their migration quiet accurately by plotting their direction with respect to the Earth’s magnetic field.

Một xí nghiệp 2 tuần đầu mỗi tuần sản xuất được 1250 sản phẩm, 3 tuần sau mỗi tuần sản xuất 1000 sản phẩm. Hỏi trung bình mỗi tuần xí nghiệp sản xuất bao nhiêu sản phẩm? Bài giải ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ......................................................................................................................................................... ...................................................................................................................................................... bài 4

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