A geography choice, ask for an explanation, a geography choice question has an answer but can t unde

B Answer: The reason for the low sediment content of the river is not only related to the high vegetation cover, but also to the construction of marshes and upstream reservoirs in the basin.

dThe answer is wrong, the amount of ice and snow melt in the Tianshan Mountains is large, and the amount of water coming from the upper reaches of the river is large; The river basin area is wide and there are many tributaries, so the density of the river network is increasing.

1. Always give yourself some psychological hints.

Many times low self-esteem is actually a psychological problem, subconsciously thinking that you are inferior to others. Many people have low self-esteem, and they think that they can't do it before they start doing it, and they will definitely fail, and of course it will be difficult to succeed in the end. If you keep hinting to yourself that I can do it, that I am not worse than others, and that I am also great, then you will be in a happy mood and will not be so inferior.

2. Start with small goals and accumulate success.

Many times self-confidence is accumulated by a little bit of success, and only a little bit to complete your own plan, you will feel that everything is not so difficult and not so scary. Many times the inferiority complex and loss are because our requirements are too high, and we can't actually bring the huge gap.

For example, if you have a monthly salary of 3,000 yuan and want to earn 10,000 yuan a month, then you should make some small plans, such as earning one or two more yuan a day, accumulating slowly, and finally finding that you will achieve your goal.

When you lose confidence, plan some small goals that you can accomplish, and then work hard to complete them, and the little success will continue to inspire your self-confidence.

3. Find out more about your strengths.

Everyone has their own strengths, and people with low self-esteem often only see their own shortcomings and not their own strengths. Always compare your own shortcomings with the advantages of others, so you have low self-esteem.

Look for your own strengths, and you will find that you are not so bad. If you look at your strengths every day, you will live a brighter life.

4. Don't care what others think.

Many people with low self-esteem always care about other people's opinions, in fact, many ideas are their own guesses, and others don't look at you at all. A lot of the time, it's a trick for yourself.

For example, if I always feel stupid when learning something, if someone happens to say it, then people with low self-esteem will think that I am stupid. It's completely okay to ignore other people's opinions, but always give yourself psychological hints, I can't do it, I can't do it, then I definitely can't learn it.

5. Socialize with people more.

Keeping your distance from others can only make you more and more closed and inferior. Be brave enough to go out and socialize with friends. Don't wrap your heart, but take it out and bask in it often, so that your heart will be full of sunshine and self-confidence will follow.

Surround yourself with positive people. Emotions are contagious. When you are with positive people, you will also become sunny and positive, and you will naturally feel joy from them. People become more cheerful, and their self-confidence increases.

6. I don't know how to stay calm when encountered.

No one is perfect, and many things will not be normal when they come into contact for the first time. When you encounter something you don't understand, stay calm. There is also a kind of inferiority complex that tends to be flustered about strange things, afraid that he will show his timidity and make people laugh.

No, no, there's nothing to be ashamed of humbly asking others for advice. Don't go there without pretending to understand, and end up making bigger jokes.

I hope it will be of some help to you when you are just starting out!

B day is 24 hours long, then B is at the pole (either the North Pole or the South Pole is possible); The night is 12 hours long, and the defense is on the equator.

If B is in the North Pole, there is a polar day phenomenon in the Northern Hemisphere. Because C's day length is less than 12 hours, it is in the southern hemisphere, and Ding's night is longer than 12 hours, and D's is in the southern hemisphere.

If B is in Antarctica, there is a polar day phenomenon in the Southern Hemisphere. Because C's day length is less than 12 hours, then C is in the Northern Hemisphere, and D's night length is longer than 12 hours, and D's is in the Northern Hemisphere.

So C is in one hemisphere, B is in the opposite hemisphere, and A is at the equator.

The conditions should be given or not, and it cannot be accurately judged to the end.

B, C, D in that hemisphere,,)

1、b2、c

3、c<>

Briefly processing the diagram, it can be seen that A is north of the Tropic of Cancer, and B is south of the Tropic of Cancer and north of the equator.

A reaches its maximum height at noon on the summer solstice, corresponding to the month of June. If you understand the picture, it will be easy to do later. Hope it helps.

1. Month A is June, A is in the area north of the Tropic of Cancer, there is no direct sunlight, and the summer solstice reaches the maximum height at noon, and B is south of the Tropic of Cancer, there is direct sunlight, and the summer solstice is not the period when the sun height is the greatest at noon.

2. The y value is the solar altitude angle at noon in place B when it hits the Tropic of Cancer directly, and the latitude value of place B is 26°26 (latitude of the point of direct irradiation)- 90-76°34) (solar altitude difference) = 10°

3. The time shown in the figure spans the winter and summer months of the Northern Hemisphere, and the sunrise direction is the summer half of the Northern Hemisphere, and the sun rises from the northeast and sets in the northwest all over the world (except for the polar day region); In the winter half of the Northern Hemisphere, the sun rises in the southeast and sets in the southwest all over the globe (except for the polar day region).

In the summer half of the year, the day of A is longer than that of B; If the maximum height of the sun at noon is [66°34,90) north of the Tropic of Cancer in the north of the Tropic of Cancer in the north of the Tropic of Capricorn, the maximum height of the summer solstice at noon is (23°26,66°34), so the maximum difference in xy will not exceed 90-23°26 = 66°34 C correctly; A can be in the polar circle, and polar day d error can occur.

d In December, the solar altitude angles of A and B showed maximum and minimum values, respectively.

a 13°26′n,76°34′+13°26′=90°;

d Polar daylight is not possible in the first place.

2The amount of solar radiation in an area is determined by the solar altitude and atmospheric transparency of the place. The higher the latitude, the smaller the solar altitude angle and the more solar radiation is weakened. Atmospheric transparency is determined by the weather, and the more sunny days, the better the atmospheric transparency, and the more solar radiation reaches the ground, which can be directly excluded.

As for the central region of the continent near the Tropic of Capricorn, the climate is basically a tropical desert climate, hot and dry all year round, and the atmosphere is very transparent, so 4 can be ruled out. 4. The climate is a tropical rainforest climate, with high temperature and rain all year round, and low atmospheric transparency, so it is impossible for the high value area of total solar radiation to appear in 2.

2. Areas controlled by equatorial depression all year round are rainy all year round and the solar radiation is not strong.

At 7:15, the sun in Hangzhou is still in the west, which means that the days are long and the nights are short, and it is the summer of the Northern Hemisphere, so the snow reflection of item 4 is definitely wrong, but because the latitude position is not listed in this question option, only item D can be selected.

It does have something to do with latitude, but the options aren't listed, so why bother with that?

The dimensionality is indeed related to the length of daylight hours, but that is the difference in seasonality (e.g., summer, winter).

The time of day when the sun sets depends on the longitude location, such as Hangzhou and Xinjiang, where it gets dark early. Of course, the lower altitude will also darken earlier than the higher altitude place. Stand tall and see far.

The comparison between early and late refers to the time in the same time zone.

This question is better with the elimination method, you can judge whether there is or not, where the altitude is a secondary reason, or a non-universal reason, that is to say, in some cases it needs to be considered and sometimes it can not be considered.

The fourth item can be excluded first, and the snow reflection only allows people to see more clearly at night, without delaying the time when the sun goes down, and then the fourth item can be ruled out, so it is obvious that only the fourth option can be chosen.

The sun rises in the east and sets in the west, a place is 7:15, and Hangzhou has fallen at night, because the longitude it is located is different, when let, due to the difference in altitude, under the same longitude, the place with high altitude, the sky is dark late.

You have to understand the primary and secondary points, and D is originally a very rare option!!

It has something to do with longitude. Jet lag is related to longitude.

1. All of this point is the polar night tangent point.

About tangent points. 1. The point at which the morning and dusk lines tangent to the latitudes of the lowest latitude in the polar day (night) region is called the tangent point.

2. The latitude of the tangent point and the latitude of the direct point are mutually congruent.

3. The tangent point is the dividing point between the morning line and the dusk line, and it is the highest point of the latitude of the morning and dusk circle.

The noon solar height of the 4 polar diurnal tangents is twice the latitude of the direct point of the sun, and is also equal to twice the noon solar altitude angle of the pole.

5. The tangent point of the polar day is in the same hemisphere as the point of direct fire.

The 6 tangent point is the lowest point of the day when the polar day and night latitude occur.

7. At the place of the meridian where the tangent point of the polar night is located, it is 12 noon; At the meridian where the apocalytic point is located, it is 0 or 24 o'clock.

8. The two tangent points appear polar day and night, and the phenomenon is opposite; The longitude of the two tangent points complements each other.

9 The two tangent points are the plantar points.

10 The diurnal tangent of the northern hemisphere, due north of sunrise and due north of sunset; The southern hemisphere polar diurnal tangent point, due south of sunrise and sunset.

The height of the sun is the angle between the sun's rays and the ground level. The point on the morning and dusk line is the sunrise and sunset, and the height of the sun at sunrise and sunset is the angle between the sun's rays and the ground levelSo the altitude of the sun on the morning and dusk line is 0 degrees.

3.Russia's population growth is low, negative growth, and the population is declining sharply, which will not only directly lead to the emergence of an aging population, but also the problem of labor shortage, which will seriously affect economic development;

4.There is a shortage of labor, there is a shortage of national defense troops, the burden on society is increasing, and the elderly are living alone.

The above is the correct answer??