Tại sao máy và thiết bị cần phải truyền chuyển động?Cơ cấu biến đổi chuyển động có nhiệm vụ gì?
2.Thông số nào đặc trưng cho các bộ truyền chuyển động quay?Viết công thức tính của thông số đó?Đĩa xích của xe đạp có 50 răng,đĩa líp có 20 răng.Tính tỉ số truyền i và cho biết chi tiết nào quay nhanh hơn?
Rearrange the sentences in order to make a meaningful conversation ,writting the correct letter(A-H) in each blank.The conversation starts with number 0
0.Mi:Nick,last Sunday my mother and I went to the mall in the city center to buy some new clothes for our Tet holiday.The streets were so bright at night
......A.Mi:I see.Do you know any other examples of light pollution?
......B.Mi:Besides the waste,light pollution may affect human health ad our sleep cycles
......C.Mi:Light pollution?Our teacher has just mentioned it in the lesson this morning.Why is too much light at night harmful?
.......D.Mi:And sometime we also have extra or unnceessary lights around the house
.....E.Nick:I enjoy Tet in Vietnam,Mi.But a lot of lights and posters along the streets may cause light pollution
......F.Nick:You're right,Mi.I think it is very wasteful because we use much more energy to light up the city or our home all day round
.......G.Nick:Because it may prevent us from seeing the stars and other planets
.......H.Nick:Yes,we can mention street lamps that shine in all directions,instead with a hood to point light downward the streets, or cities with lights all night long
Combine each pair of sentences,using the words/phrases in brackets.You can make some changes:
28.We are unable to see the stars in the sky.Light pollution occurs(makes)
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29.Glass panels,windows,lawns and roofs make light pollution worse.They reflect both artificial and sun light(because)
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30.All sounds are not noise.Noise is any sound that is unwanted and goes beyond its certain limit,for example,above 80 decibels
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31.More and more noise is created by modern evilization.It has now become a major environmental pollutant,especially in urban areas
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32.Contamination in the air happens.There is acid rain which damages soil,vegetation and auatic life of the region(causes)
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33.Noise pollution is one of the major causes of stress and anxicty.People suffer from stress and anxiety.(because of)
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Circle the mistake in each sentences,and then correct it:
| 22.Long exposure to loud noise results permanent hearing loss | ..................................................... |
| 23.The misuse of ressources and improper dumping of waste make land pollution | ..................................................... |
| 24.The soil becomes comtaminated because the use of so many pesticides and other farming chemicals | ..................................................... |
| 25.Oil slicks from boats or ships pollute the sea,because many fish and sea-birds die | ..................................................... |
| 26.In many developing countries,water pollution is usually a leading cause of death if people drink from polluted water sources | ..................................................... |
| 27.We should plant trees in our neighbourhood so trees help cool the planet | ..................................................... |
| Tên nước | Vị trí địa lí | Điều kiện tự nhiên | Đánh giá thuận lợi,khó khăn |
| Lào | |||
| Campuchia |
Rearrange the sentences in order to make a meaningful conversation,writing the number(1-8) in each blank.The first 0 has been done for you
0 Mai:Our group will give a presentation about visual pollution.It's the new to me.Do you know what it is,Phong?
......A.Phong:Yes,maybe.Because billboards,litter,or junkyards can also be considered visual pollution
.......B.Mai:I hate seeing a man throw an empty eigarttc package from a motorbike or a car.He should be given a fine
.......C.Mai:Oh,I see.Can you give some examples of it,Phong?
.......D.Phong:That's right.There are rules,or regulations that apply punishment to anyone that makes the surroundings ugly.I dislike seeing to many billboards along the streets.How about you,Mai?
.......E.Mai:Can we visual pollution when we walk along the streets?
.......F.Phong:Well,visual pollution is anything that makes our neighbourhood unattractive or unpleasant,Mai
........G.Mai:All of us should try to protect the beautiful sight around us.We must have laws or regulations to prtotect our pretty landspace
........H.Phong:Yeah,for example,skycrapers or high buildings that block a natural view,graffiti or carving on the trees or rocks
| to stop them By the way into the river to do about it that's terrible! |
Mai:You know,there's a factory outside our town that's pumping chemicals(1)........
Nick:How can they do that?Isn't that againist the law?
Mai:Yes,it is.But a lot of companies ignore those laws?
Nick:(2)....... .What can we do now?
Mai:Well,one thing(3).......is to talk to the management
Nick:What if that doesn't work?
Mai:Well,that another way(4).......is to get a TV station to run a story on it
Nick:Yes!Companies hate bad publicity.(5)........,what's the name of this company?
Mai:It's called Apex Industries
Nick:Oh,no.It was in the news last month
Answer the questions,using conditional sentences type 2:
1.What would you do if you had a garden of your own?
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2.If you had one wish,what would it be?
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3.What would youu do if you won Cl million?
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4.What would you do to make our school ground greener if you were the principal?
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5.What would you do if you were the Earth Hour Goodwill Ambassador?
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