Cho tam giác ABC vuông ở A, lấy D là điểm bất kì thuộc cạnh BC. Gọi E là điểm đối xứng với D qua AB, F là điểm đối xứng với D qua AC A) Chứng minh rằng A là trung điểm của EF B) Điểm D ở vị trí nào trên cạnh BC thì EF có độ dài ngắn nhất

chứng minh sách là ngọn đèn sáng bất diệt viết bài văn

James Cook was born in England (43) 1728. His parents (44) poor farm workers. (45) James was 18, he found a job on a coastal ship. He worked (46) ships until he was 27 years old, and then he joined the navy. He fought (47) Canada in a war against France. In 1768 King George III made him the captain of a ship and (48) him to the Pacific. He was gone (49) nearly three years when he (50), he was a national hero. 43. A. in B. at C. on D. during 44. A. are B. be C. were D. was 45. A. while B. when C. because D. during 46. A. in B. on C. for D. under 47. A. at B. in C. to D. against 48. A. got B sent C. send D. sending 49. A. in B. since C. for D. during 50. A. got B. came C. returned D. arrived

Giúp nình caqu này đi mọi người

43. We’ll get there early so that we’ll be able to get tickets. A. If we get there early, we’ll be able to get tickets. B. If we don’t get there early, we’ll be able to get tickets. C. If we get there early, we won’t be able to get tickets. D. Unless we get there early, we’ll be able to get tickets. 44. “Close your books and go out to play”, the teacher said to us. A. The teacher told us close our books and go out to play. B. The teacher told us to closing our books and go out to play. C. The teacher told us closing our books and go out to play. D. The teacher told us to close our books and go out to play. 45. My dad worked in a factory in the past, but doesn’t work there now. A. My dad used to working in a factory. B. My dad used to be working in a factory. C. My dad used to work in a factory. D. My dad used to be work in a factory. 46. Mr. Peter has written a lot of articles for the CNN News. A. A lot of articles have written for the CNN News by Mr. Peter. B. A lot of articles have been written for the CNN News by Mr. Peter. C. A lot of articles has written for the CNN News by Mr. Peter. D. A lot of articles has been written for the CNN News by Mr. Peter. 47.Althoughhewastired, hefinisheddoinghishomework. A. In spite his tiredness, he finished doing his homework. B. In spite of his tiredness, hefinished doing his homework. C. In spite of he was tired, he finished doing his homework. D. In spite his tired, he finished doing his homework. 48. He is a much slower speaker than my brother. A. He speaks much more slowly than my brother. B. He doesn’t speak much more slowly than my brother. C. He speaks much more quickly than my brother. D. He doesn’t speak much more quickly as my brother. 49. They often went to school by bike when they were young. A. They used go to school by bike when they were young. B. They used to going to school by bike when they were young. C. They used to go to school by bike when they were young. D. They used to went to school by bike when they were young. 50. She has taught her children to play piano for 4 years. A. She started teaching her children to play piano 4 years ago. B. She started to teaching her children to play piano 4 years ago. C. She started teaching her children to play piano for 4 years ago. D. She started teaching her children to play piano since 4 years.

lúc 12 giờ kim giờ và kim phút tạo thành 1 góc

Để m(g) Fe trong không khí bị oxi hóa 1 phần thành 22(g) hỗn hợp các oxit và Fe dư. Hòa tan hỗn hợp này vào dung dịch HNO3 dư thu được 4,48 lit khí NO duy nhất (đkc). Tìm m.

phát hiện lỗi sai áha Write the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions. Question 21: When we are (A) on holiday (B) , we used to go to (C) the beach every day (D) . Question 22: We wish we can (A) consult an (B) expert on how to solve (C) this problem (D) . Question 23: The environmentalist suggest (A) planting (B) more trees to improve the city’s landscape (C) and the environment as well (D). Question 24: He works (A) much more hard (B) for his exams than he does (C) for his normal (D) schoolwork.

Giúp mình nhanh nhé mình sắp phải nộp rồi 🥺🥺🥺🥺🥺🥺🥺🥺🥺

Câu 1: Du lịch biển mới tập trung ở hình thức A. tắm biển. B. bóng chuyền trên cát. C. du thuyền. D. lặn biển. Câu 2: Dọc bờ biển nước ta có A. ba cơ sở sản xuất muối lớn. B. hai cơ sở sản xuất muối lớn . C. một cơ sở sản xuất muối lớn. D. không có cơ sở sản xuất muối nào. Câu 3: Bãi cát có chứa ôxittitan có giá trị xuất khẩu thuộc A.Hải Phòng . B. Vũng Tàu. C. Quảng Ninh, Khánh Hòa. D. Đà Nẵng. Câu 4: Tài nguyên khoáng sản quan trọng nhất ở thềm lục địa là A. dầu mỏ . B. Khí thiên nhiên. C. dầu mỏ, Khí thiên nhiên. D. quặng. Câu 5: Cả nước hình thành được A. bốn cụm cơ khí đóng tàu biển. B. năm cụm cơ khí đóng tàu biển. C. sáu cụm cơ khí đóng tàu biển D. ba cụm cơ khí đóng tàu biển: Bắc, trung , nam . Câu 6: Ônhiễm biển dẫn đến hậu quả nghiêm trọng về A.sinh vật biển, du lịch biển. B. Giao thông biển. C. khoáng sản biển. D. muối biển. Câu 7: Trong bảo vệ tài nguyên môi trường biển có A. 2 phương hướng chính. B. 3 phương hướng chính. C. 4 phương hướng chính. D. 5 phương hướng chính.