Hình học không gian 12 Giúp mình câu 1 với ạ

Tìm ảnh của đườg tròn(C):(x-4) ^2 +(y-3) ^2=5 qua phép quay tâm I (-3;1) góc quay -90

Viet doan van trinh bay suy nghĩ cua em ve danh ngon : "một nụ cười có thể thay đổi một ngày một cái ôm có thể thay đổi một tuần một lời nói nói có thể thay đổi một cuộc sống " -giup tui voi mai tui nộp r :<

Trộn 100g dung dịch AgNO3 17% với 200g dung dịch Fe(NO3)2 18% thu được dung dịch A có khối lượng riêng (D = 1,446g/ml). Tính nồng độ mol/l của dung dịch A

The festival is Hue. Ba wishes he ...... in Hue. A. stay B.stayed C.stays D. to stay

cho 1 gen có 120 chu kì xoắn. a. chiều dài b. số nu mỗi loại bt A=20% c. số liên kết hidro d.số liên kết hóa trị giữa các nu trên 2 mạch

Mọi người giải giúp em với ạ. E cảm ơn

Trong văn bản LÃO HẠC em thích nhất là đoạn văn nào ?vì sao??? ( từ 7->10 dòng) Làm giúp mk nhé.THANKS

ví dụ về môi trường ưu trương, nhược trương ,đẳng trương

1. Inventors are skilled at spotting ways to improve a situation or process. A. Inventors are keen on spotting ways to improve a situation or process. B. Inventors are practical in spotting ways to improve a situation or process. C. Inventors are well-known for spotting ways to improve a situation or process. D. Inventors are professionally trained to spot ways to improve a situation or process. 2. Scientists and inventors have made significant contributions to the lives of the common people. A. Significant contributions have been made by scientists and inventors to the live of the common people. B. Scientists and inventors had contributed significantly to the lives of the common people. C. The lives of the common people have been significantly constructed by scientists and inventors. D. The contributions which scientists and inventors made to the lives of the common people was significant. 3. Shockley's book describes the research leading to the invention of the transistor. A. Shockley's book is a means of describing the invention of the transistor. B. It is the invention of the transistor that is described in Shockley's book. C. The research leading to the invention of the transistor is described in Shockley's book. D. A description of the research leading to the invention of the transistor makes Shockley's book. 4. The more often ideas come together, the more frequently invention occurs. A. Whenever more ideas come together, it comes to the occurrence of inventions. B. The number of inventions that occur increases when a number of ideas come together. C. It is only when more ideas come together that inventions occur more frequently. D. The frequency of invention occurrence is decided by how often ideas come together. 5. Watt spent much time and money in making experiments, but nothing he tried succeeded. A. Although Watt spent much time and money in making experiments, nothing he tried succeeded. B. Despite his failure after trial and trial, Watt spent much time and money in making experiments. C. As Watt spent too much time and money in making experiments, nothing he tried succeeded. D. If Watt hadn't spent much time and money in making experiments, anything he tried would have succeeded. 6. The carbon dioxide gas given ____by the fermenting vat was known as "fixed air". A. off B. away C.out D. up 7. In 1772, Priestley published____description of how to make carbonated water, using sulphuric acid and chalk. A. a B. its C. a D. each 8. Priestly found he could dissolve the gas in the water and that it____a refreshing drink-of a kind that met the approval of his clean-living, religious-minded friends. A. makes B. made C. has made D. was made 9. ____was Giovanni Luppis, an officer in the army of the Austrian empire, who first came up with the idea of a self-propelled anti-ship weapon. A. That B.There C. It D. He 10. The bicycle as we know it today was originally developed as the "safety bicycle" because other bikes____were extremely dangerous. A. at the time B. at a time C. for a time D. for the time.