Câu 1: Xung quanh ta có nhiều chất khác nhau. Mỗi chất có những tính chất đặc trưng nào để phân biệt chất này với chất khác?

Calli: "It's coming to Rome" NL: 2 bức nha.

Giúp mình bài này với mọi người

Vẽ sơ đồ cách tách 3 chất Al, Cu, Mg ra khỏi hỗn hợp. Ví dụ ở dưới ạ

calli : "yew Dâu" :33 NL: hóng hóng :33~~

Cho tam giác ABC không vuông. Gọi H là trực tâm của nó. a) Hãy chỉ ra các đường cao của tam giác HBC. Từ đó hãy chỉ ra trực tâm của tam giác đó. b) Tương tự, hãy lần lượt chỉ ra trực tâm của các tam giác HAB và HAC. Cần gấp ạ

Zẽ anime /chibi Nhạc họa vắng '-'

Cần gấp >>>>> Vì sao tuổi dậy thì, đầu ti con gái lại đau ?

The students said that the English test_________ the most difficult one that they had ever done. (2.5 Điểm) Mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions. A. will be B. were C. is D. was 2.Question 5: (2.5 Điểm) Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct word for each of the blanks. We are slowly (4) ______ the earth. The seas and rivers are too dirty to swim in. There is so much smoke in the air that is unhealthy to live in many of the world’s cities. In one well-known city, for example, (5) ________ gases from cars pollute the air so much that traffic policeman have to wear oxygen marks. We have cut (6) _______ so many trees that are now vast areas of wasteland all over the world. As a result, farmers in some parts of America can’t grow enough to eat. In certain countries in Asia, there is too little rice. (7)__________, we do not take enough care of the countryside. Wild animals are quickly disappearing. For instance, tigers are rare in India now because we have killed too many for them to survive. We must act now before it is too (8) ________ to do anything. Join us now. Save the earth. It is too important to ignore. A. poisoned B. poisonous C. poison D. poisonously 3.The road in front of my house was flooded __________ the heavy rain. (2.5 Điểm) Mark the letter A, B, C or D on your answer sheet to indicate the best answer to each of the following questions. A. although B. because of C. so D. because

Giải thích giúp 1. You will have to pay .... to what you do ( attend ) 2. The victims were .... after the earthquake hà happened ( conscious) 3. Thousands of people were made .... by the earthquake .(home) 4. Smoke from the factory contains many differents ... chemicals (poison)