Thiết kế mạch điện gồm 1 cầu chì, 1 công tắc đơn điều khiển 2 đèn sáng tỏ. Thiết kế mạch điện theo từng bước

Muốn pha chế 100 lít rượu chanh 40độ cần dùng bao nhiêu lít cồn 80độ?

Giải hộ mình bài 1 mình cần gấp lắm cảm ơn trước

Giúp em với ạ. Em đang bí câu b ạ.

giúp tôi với mn . vote 5 sao và ctlhn nha :3

2. Please give me ______pen that is on the counter.

Cho n € N* và n + 1 và 2 n + 1 là số chính phương . Chứng minh n chia hết cho 12

Bài 9 : cho đoạn thẳng AC = 5cm. Vẽ điểm B trên đoạn thẳng AC sao cho BC = 3cm. a) Tính AB? b) Trên tia đối của tia BA vẽ điểm D sao cho BD = 5cm, so sánh AB và CD. c) Hỏi B có là trung điểm của OA không? Tại sao? ko cần vẽ hình đâu nha

COMBINE THE FOLLOWING SENTENCES USING THE WORDS IN BRACKETS. 1.Noise pollution happens. There is a change in animals’ living pattern. (causes) → ..................................................................................................................................................... 2. Radioactive pollution is very dangerous. It can cause abnormal growth. (since) → .................................................................................................................................................... 3. The area is uninhabitable. The Chernobyl nuclear accident happened. (made) → ...................................................................................................................................................... 4. Fossil fuels such as coal or oil are burned. Acid gases are produced. (so) → ....................................................................................................................................................... 5. Acid rain is dangerous. Trees’ leaves are damaged. (because of) → ....................................................................................................................................................... 6. Leaves are damaged. The tree cannot get enough food energy to stay healthy. (because) → ......................................................................................................................................................... IV. Find the words that need correcting. 1. Hundreds of houses destroyed after a tornado hit the small town of Texas. A B C D 2. The earthquake occurred at midday when many people had had lunch. A B C D 3. Water pollute in the lake has made the fish die. A B C D. 4. Factories won’t dump waste into rivers if the government will fine them heavily. A B C D V. Rewrite the sentences in report speech. 1. ‘I have been given a new laptop.’ Michael told me that …………… 2. ‘I’m leaving Viet Nam tomorrow’ Olive told Chau that ……….….. 3. ‘I didn’t say anything at the meeting last week.’ He said that …………… 4. “In 50 the years’ time we may be living on the moon.’ They announced that………………………………………………………………………………. IV. Rewrite the following sentences so that the second sentence means the same as the first one. 1. Scientists have invented new devices to help people live a longer life. New devices …………………………………………………………….……………………… 2.I don’t have enough time , so I can’t go on holiday this summer. If ………………………………………………….………………………………………… 3. The rescue workers evacuated the villagers in the raged flood to the safe place last night. =>The villagers in the raged flood…………………………………………………………….. 4. The students will provide aids for the homeless people tomorrow. -->Aids…………………………………………………………………………………………… 5. The people will protect the environment now. The environment will be nice If…………………………………………………………………………………...…………… 6. They don’t have a map, so they get lost If…………………………………………………………………………...………………… 7. The storm destroyed many houses in this village last week. -->Many houses……………………………………………………………………...……….. 8. Did they give food to homeless people last year ?-->Was…………………………….……………………… 9.Although the weather was bad, the fooball match was not canceled. -->Despite…………………………………………………………………………………...…… 10.Many rivers and lakes are poisoned. Factories produce waste and pour it into rivers and lakes.( because ) ………………………………………………………………………………………… 11. Plastic bags are a major source of waste. We should not throw plastic bags everywhere. (so) ………………………………………………………………………………………………… 12. We won’t hold the festival. It costs too much money. (IF) => …………………………………………………………………………………...…………… 13. The tortoise was running. The hare was sleeping. (WHILE) =>…………………………………………………………………………………...…………… 14. The girl worked hard. Her stepmother wasn’t happy. (ALTHOUGH) =>…………………………………………………………………………………...…………… 15. Peter didn’t go to school yesterday because he was sick. => Because of …………………………………………………………………………………… 16. Mary went to bed early because she felt tired. => Because of ………………………………………………………………………………….… 17. She didn’t go to the circus with Betty because she had a bad cold. => Because of …………………………………………………………………………..…..……

Hãy nêu công thức của axit của các nguyên tố sau: S(VI), P(V), C(IV), S(IV), N(V).