Động cơ thang máy thực hiện công để đưa thang máy lên cao. Công trong trường hợp nào sau đây là lớn nhất? Biết thang máy khi không mang vật nào thì có khối lượng là 500 kg. A. Thang máy không mang vật nào và lên cao 20 m. B. Thang máy mang vật 100 kg và lên cao 25 m. C. Thang máy mang vật 50 kg và lên cao 30 m. D. Thang máy không mang vật nào và lên cao 35 m. giải thích với ạ

Câu 1: Vai trò của rừng và trồng rừng? Câu 2: Nêu nhiệm vụ trồng rừng của nước ta?

I.Choose the word in each line that has different stress pattern. 1.A. ecology B. environment C. autography D. residential 2. A. physiography B. alternatively C. criminology D. unsuccessfully 3. A. temporary B. geology C. emergency D. logography 4. A. astrology B. unnatural C. medication D. demography 5. A. voluntary B. apology C. television D. nationalize II. Complete each sentence with the correct word from the box. drought flood hurricane landslide tornado 1.When there is a _____________, a lot of water covers an area where the usually isn’t water. 2. A______________ refers to a long time without rain. 3. When there is _____________, a lot of rocks and earth fall down a hill. 4. A __________________ is a storm with a lot of wind that moves over water. 5. A__________________ is a storm in which the air moves very quickly in a circle. III. Complete the sentences with the past perfect form of the verbs in brackets. 1.Anita said she was very sorry for what she (do)…………………………… 2. When Sam (pay)…………………. The bill, we left the restaurant and went home. 3. It wasn’t surprising that she was tired .She (not sleep)………………….. for two days. 4. The road was blocked because a lorry (break down)……………………….. 5. My mother felt very nervous on the plane because she (not fly)………………..before. 6……………………………….(they/go) home when you arrived? 7. I (hear)……………the story before , so I didn’t find it very interesting. 8. After she (try on)…………………….. all the dresses in the shop, she bought the most expensive one. 9. They (not have)………………..breakfast when I got up. 10. The children were very excited because they (not see)………………….a tiger before. IV. Complete the sentences withthe correct form of the verbs in brackets. 1.After Nick (do)………………..his homework , he (go)………………..to bed last night. 2. Mai (live)……………..in Hai Phong for five years before she (move)…………… to Ha Noi three years ago. 3. Phong (tell)……………..me yesterday that he (learn)……………..French for a year. 4. Ms Hong (work)……………….at our school for twenty years before she (retire)………….last June. 5. By the time I (get)………………….to Nick’s house , his party (already/start)…………….. 6. When we (come) ………………………..back to our home village last month , it (change)……………………………so much. 7. By the time the bus (come)……………this morning, Duong (wait)………………..for it for half an hour.

Làm tròn số các số sau đến chữ số thập phân thứ 2: 0,384 ; 0,076 ; 0,038. mk ko giỏi về kĩ năng làm tròn số cho lắm

Giúp em ạ là những người giỏi giúp nhé

bạn nào làm được bài này giúp mình ạ

Giải hộ mình với ạ giải chi tiết

Fill in the blank with a word/ phrase in the box. trains discourage transport expensive example problem cities pollution Traffic congestion in many (1) around the world is severe. One possible solution to this (2) is to impose heavy taxes on car drivers and use this money to make public transport better. One of the first benefits of such a measure is that the heavy taxes would (3) car owners from using their cars because it would become very (4) to drive. This would mean that they would begin to make use of public (5) instead, thus reducing traffic problems and (6) as well. Another benefit would be that much more use would be made of public transport if it was improved. It is often the case that public transport in cities is very poor. For (7) , we often see old buses and (8) that people would rather not use. High taxes would generate enough money to make the necessary changes giúp với ạ

1 : kathy usually.... in front of the window during the class A sits B sitting C sit D is sit 2: what does this word..... ? A means B meaning C mean D is mean 3: he ...share anything to my A don't B isn't C not D doesn't 4:I com From Canada Where ..... you come from A are B do C is D not 5: Jane ...tea very often A doesn't drink B drink C is drink D isn't drink 6: how often ..... you play tennis A do B are C is D play 7: rice ....in cold climates A isn't grow B don't grow C aren't grow D doesn't grow 8:I ... compass and a calculator in Maths lesson A am use B use C aren't use D doesn't use

Giúp mk vs ạ mn ơi Mk Cảm ơn trc nha ....