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If there is no dust!
If there is no dust
Dust is a nuisance to everyone. It is harmful to environmental health and human health. Therefore, from ancient times to the present, people always "wipe it frequently, do not make it contaminated with dust". However, have you ever thought that human beings can not live without dust
If there is dust in nature, what kind of situation will we face?
The diameter of dust particles is generally between ten thousandth to one millionth of a millimeter. The dust that can be seen by human eyes is a huge thing, and the fine dust can only be seen under a high-power microscope. The main sources of dust are soil and rock. After weathering, they split into small particles. These particles float in the air together with other organic particles
Dust absorbs part of the sun's light and reflects it all around at the same time. Just like countless point light sources, sunlight is greatly weakened by the reflection of dust and becomes soft. If there is no dust in the atmosphere, strong sunlight will make people unable to open their eyes
Interestingly, dust also has a strange temper. It is easy to reflect the violet, blue and cyan light with shorter light wave, and "like" to absorb other light with longer light wave. Due to the high content of dust in the lower atmosphere, the sky we see on the ground is blue. If there is no dust in the atmosphere, the sky will become a vast expanse of white
Most of the dust is hygroscopic. The water vapor in the air must adhere to the dust to condense into small water droplets. In this way, when the water vapor in the air reaches saturation, the dispersed water vapor will adhere to the dust to form stable water droplets, which can float in the air for a long time. If there is no dust in the air, everything on the ground will be wet, If there is less and less water on the earth, and it dries up completely in the end, living things will not survive. In addition, because of the refraction of these small water droplets on the sun, there will be natural scenery such as sunset glow, idle clouds and fog, rainbow halo and so on, How monotonous nature will be!
The explanation of words in Lesson 18 of the Vocabulary Manual of grade 6 Volume 2
The answer is a surprise
18
Beauty over a century
Radioactivity: the instability of certain elements, such as radium and uranium
The property of emitting rays spontaneously and decaying into other elements
Radium:
, symbol RA, silver white and glossy, radioactive, found in a variety of ores and minerals
In medicine, it can be used to treat cancer and cancer
.
The sound of people is as noisy as boiling water in a cauldron,
It has three feet and two ears, mostly made of bronze
Indifference: (to fame and fortune, etc.) detachment, not pursuit
Solemnity: (speech, behavior) not casual, not frivolous
Freeze frame: 1. The moving pictures of movies and TV suddenly stop on a certain picture
2. Fixed format; certain specifications
Take the first meaning in the text
Beautiful and solemn image
The moment of life is always in people's memory
To purify or extract from a compound or mixture by chemical or physical means
Smelting: Using
The required metal is extracted from ore or other raw materials by melting and smelting
One substance is evenly dispersed in another. For example, salt becomes salt water when it is put into water
Fortitude: fortitude
Persistence: originally
It refers to persisting in a certain thing. Later, it refers to obstinacy or rigidity, and it also refers to perseverance
Persistent
.
Outstanding achievement or effect. Table, excellence, superb
Fatigue: physical fatigue, lack of strength
It refers to the events that can be used as symbols in the process of historical development
Up to now, up to now, up to now
：
It's famous for Sweden
, industrialists
inventor
(1833-1896) as a foundation
Including gold medal, certificate and bonus
In the whole process of the selection, the winner will not be affected by any nationality, nationality, nationality, etc
And the influence of religion, the only criterion is the size of the achievements
As always: exactly the same as the past. One, all, all. Past, past
Fame: a great reputation
Words with exactly the same meaning as in the past
As always
There is such a series of numbers, 40, 60, 50, 55 --- starting from the third number, which is the average of its first two numbers. Find the integer of the tenth number in the number
This is the integral part of the tenth number in the number. What about the 100th?
Write it down
40,60,50,55,52.5,53.75,53.125
The latter number is between 53.75 and 53.125
So the integral parts of the 10th and 100th numbers are 53
3.5x + 1.8 = 12.33.6x △ 2 = 2.16 x × (16 + 38) = 1312 equation
3.5X＋1.8＝12.3
3.5X=12.3-1.8
3.5X=10.5
X=10.5/3.5
X=3
3.6X÷2＝2.16
3.6X=2*2.16
3.6X=4.32
X=4.32/3.6
X=1.2
x ×(16+38)=1312
54X=1312
X=1312/54
X=656/27
This paper selects the characters and related contents in the five famous works: outlaws of the marsh, journey to the west, Robinson Crusoe, childhood and how steel is made
Write the next couplet for the given upper couplet
The first couplet: Beethoven's painstaking efforts to compose famous music
Second couplet:
Outlaws of the Marsh: Lu Zhishen's great efforts
Journey to the West
Robinson Crusoe: growing food on his own
Childhood: aliosha's love hate distinction and his view of the world
How steel is made: Kochakin's indomitable resistance to fate
If you think it's good for you, give it to me
20 * 40 = 800, 42 * 20 = 840, 25 * 10 = 250, 20 * 15 = 300, what rules do you find through calculation? I really can't see it
20*40=800
42*20=840
25*10=250
20*15=300
If there are several consecutive zeros in the end of the multiplicand and the multiplicand, multiply the number in front of the zero first, and then add the number of zeros at the end of the multiplicand and the multiplicand after the product
How to simplify the operation of 9 * 1.5 + 9 * 4.5
9x(1.5+4.5)=9x6=54
Xiao Cong and Xiao Ming have some glass balls. Xiao Cong says to Xiao Ming, "my glass balls are twice as big as yours." Xiao Ming says to Xiao Cong, "if you give me three, we'll have the same number." how many glass balls do they have?
According to the stem analysis, the number of Xiaoming's glass balls is 3 × 2 = 6, XiaoCong's glass balls is 6 × 2 = 12, a: XiaoCong has 12, Xiaoming has 6
There are three continuous natural numbers. One of them is a. what are the other two numbers?
a-1 a+1
RELATED INFORMATIONS
- 1. Understanding of the original sentences in beauty over a hundred years She knows that only the flower of discovery and creation can have eternal beauty. So she is willing to let acid and alkali gnaw her soft hands and let the choking smoke wrinkle her beautiful forehead Tell me what you read and what you think of?
- 2. 18 across a hundred years of beautiful text main content, key sentence analysis
- 3. Why is the topic of beauty spanning a century called beauty spanning a century
- 4. What is the method used in Lesson 18 "beauty across a hundred years" of PEP (Volume 2, grade 6 of primary school)?
- 5. Answers to Feng Zikai's childhood reading questions
- 6. Feng Zikai's childhood reading comprehension
- 7. The main contents of the sixth unit of the Chinese language in the sixth grade volume I of the people's Education Press
- 8. Unit 6 in Grade 6 tapping on the gate of poetry
- 9. Birch style is (), the author is () poet (). Poetry centers on (), expressing the poet's love for () and () emergency
- 10. The title of Bai Hua Birch takes () as the object of description. It describes her beauty from different angles, and also contains praise for () people
- 11. Exercise of "if there is no dust" in Lesson 12 of Chinese for Grade 5 of PEP
- 12. New leaf's reading answers unit 1 test of basic training newly compiled by people's Education Press, 1. Use tick to add some words to the text and choose the correct pronunciation Write a phrase in green and crisp The transition section in the article is the natural section. Its function is to carry on the sentence and open the next sentence 4. Write poems about infinite blue and other red 5. Draw the sentences of green leaves' Enlightenment to life in the original text with wavy lines
- 13. Four answers to the reading questions in the exercise book 4. An unforgettable thing After school on Tuesday afternoon, I took my neighbor's little sister to the street The street was full of people. We came to an old man's toy stand and saw a beautiful comb. I asked him, "how much is this comb?" "fifty cents, it's very convenient," he said. I took out fifty cents and gave it to him. I put a comb in my pocket and went back Children, come back quickly, we'll come back quickly. Why didn't you take the comb? My grandfather said while he put a comb into my hand. I hesitated for a while and left with the comb When I got home, I told my mother all about it. My mother criticized me severely, saying that I took advantage of others and asked me to send back my comb and apologize to my grandfather. Thinking of my grandfather's kind face and sincere expression, I felt that I didn't deserve to be a young pioneer, so I decided to return my comb The next day after school, I went to find my grandfather, but I didn't find him. I didn't see him for five days Although it's been a long time, I feel guilty when I think about it 1. Use "√" to punctuate the passage and choose the correct pronunciation 2. Punctuate the third paragraph of the passage 3. Write the synonyms of the following words Exquisite () hurry () hesitation () guilt () 4. Why does the old man who sells combs shout "we" back? From here we can see what kind of person he is? ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿ 5. Why should I return my comb and admit my mistake to my grandfather? ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿
- 14. Answers to Lesson 18 in the Chinese exercise book of the fifth grade of primary school published by Jiangsu Education Press
- 15. Answers to lesson 6 in Chinese exercise book
- 16. Economy is a virtue Every citizen has a sense and behavior of saving. The reason why the sense and behavior of saving is more important is that it is more common, more lasting and more effective. The government's policy and behavior can only benefit for a while, only when saving is internalized into every citizen's conscious behavior, This thrifty society naturally came into being. Being warm, kind, respectful, thrifty, yielding, diligent and thrifty have been the virtues of the Chinese nation since ancient times. But today, the implementation of the market economy has brought great wealth to the country and individuals. At the same time, the fine traditional virtues and style of "saving" the nation and the Communist Party of China have gradually been weakened, Today, to promote the construction of a conservation oriented society is not only the requirement of government work, but also the expectation of personal life style Saving, as a virtue, has two realms and levels for individuals: Saving Private Property and saving public property. Saving private property is to cherish the fruits of one's own labor, which is a kind of private virtue. Saving at this level is easy to achieve, but when a person has private material wealth to a certain extent, due to the difference of quality, it is difficult to achieve, It is not easy for some people to economize and cherish their wealth and the fruits of their labor. Moreover, the society can not interfere with the private morality of individuals, no matter from the perspective of moral or legal constraints. Because of this, many people have the mentality of "how I spend my own money anyway" when they are extremely extravagant and wasteful, It is a kind of public morality to cherish the public property and the collective fruits of common labor. Compared with the previous level, the level of saving is higher, but it is also more difficult to achieve. Here, we can only appeal: waste of public property is equal to waste of private property in essence. Because this public property is your own hard-earned money Today's developed countries have unparalleled wealth in developing countries, but in these developed countries, no matter the government, enterprises or individuals are actually very thrifty, saving even makes you have this impression: from the perspective of whether the government departments spend fiscal (taxpayer's) money, or the way enterprises and individuals spend their own money, Rich and developed countries are more like poor and backward countries, while those poor and backward countries are more like developed countries. For example, Toyota's output value today has reached hundreds of billions of dollars, and one company has surpassed several Guangdong provinces. But do you know that the employees there still use used copy paper as notes. Moreover, this is not an individual phenomenon, it is common for people, Let alone the government spending money, because they know that every penny is taxpayers' money. By contrast, our government, enterprises and even individuals are not ashamed. Not only do people not easily spend their own money, but also they dare not spend their public money. We are not so much spending our own money, let alone the public money, On the contrary, it doesn't matter when the economical society and the harmonious society will be As a virtue, economy has two realms for individuals. Which two words are used to summarize these two realms? 15. Why is the waste of public property equal to the waste of private property? 16. Please add an example of economy to paragraph 3 to make the argument more sufficient 17. Saving is a new topic. You must have many excellent saving behaviors. Please choose two of them and talk about the significance of doing so
- 17. There should be social drama, Ansai waist drum, great tragedy, in the center of the desert, gazelle flying, cat reading comprehension. The more the better
- 18. Answers to the matching exercise book of the people's education press of the people's Republic of China
- 19. Four seasons reading answers of comprehensive rain detection in the second volume of seventh grade Chinese exercise book
- 20. Is the system of equations x = 1 (1) y + 2 = 3 (2) a system of linear equations of two variables? Do the two equations of the system of linear equations of two variables have to contain two unknowns? Isn't a system of linear equations of two variables only composed of two linear equations of two variables?