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The upstairs is too complicated

Teach you a simple method, very practical, generally we know that the day is divided into morning and afternoon, 12 noon is their equinox.

That is, 12 - sunrise time = sunset time - 12

According to this formula, OK, it's 19 points. Choose A

1. The dividing line of the eastern and western hemispheres is 20° west longitude and 160° east longitude, according to the law of longitude change: along the direction of the earth's rotation, the east longitude increases (the west longitude decreases), it can be seen that the meridian where a is located in the figure is 160 ° east longitude, the meridian where c is located is 20 ° west longitude, and the meridian where b is located is 110 ° west longitude (because the meridian where b is located is the midpoint of the night hemisphere, and the east and west span longitude is 90 degrees).

Then from the question stem "the western hemisphere and the night hemisphere are completely consistent", that is, the meridian line coincides with the morning and dusk line, it can be judged that it is the spring equinox day or the autumn equinox day, and then according to the direct sun point return to the law of motion: after the spring equinox, the direct sun point moves to the north of the equator; After the autumnal equinox, the direct sun point moves south of the equator, and combined with the inscription "At this time, the direct sun point moves southward", it can be judged that the northern hemisphere is autumn (Northern Hemisphere autumn: September to November).

3. How to find the coordinates of the direct sun point:

Direct Radiation: From the figure, it can be seen that the Sun is directly at the equator (0°); Direct longitude: the meridian where 12 o'clock in local time, it can be seen from the figure that 110° west longitude is the midpoint of the night hemisphere, which should be 0 (or 24 o'clock), 110 ° west longitude and 70 ° east longitude form a meridian coil, and 0 o'clock in the evening corresponds to 12 o'clock in the day, so the coordinates of the direct sun point (0 °, 70 ° E) at this time.

4. Determination method of morning and dusk line: along the direction of the earth's rotation (from west to east), the line from the night hemisphere to the day hemisphere is the morning line, and the line from the day hemisphere to the night hemisphere is the evening line. It can be seen that in the figure, the arc NAS is the dusk line, and the NCS is the morning line.

March 21 is the vernal equinox, so day and night are equal, and the answer is a

I've done a similar problem before: I know the latitude a of the direct point of sunlight on the earth, find the sunrise time at any point on the earth (the known latitude is b), and get a formula: t=12*arccos(tga*tgb) (for the northern hemisphere).

Bring your question conditions into this formula to get:

Winter solstice: The direct point of the sun is at the Tropic of Capricorn, a -23°26, and the latitude of the Tropic of Cancer b = 23°26, so the sunrise time t = 6:43:12 in the morning.

Summer solstice: The direct point of the sun is also at the Tropic of Capricorn, a=b=23°26, and the formula is t=5:16:48 in the morning.

Sunrise and sunset are symmetrical at 12 noon, with the Tropic of Cancer on the winter solstice at 5:16:48 p.m. and the summer solstice at 6:43:12 p.m.

In fact, the atmosphere also has a refractive effect, so the actual sunrise time will be slightly earlier than the time calculated according to the above formula.

As for the detailed derivation process of this formula, it needs to be drawn, and it can't be operated here, so I won't talk about it

March 21 is the vernal equinox, so the time of day and night are equal, so the time point of 7:00 is pushed back by 12 hours, so choose A

**The time should be wrong:

March 21 is the day of the vernal equinox, the global equinox, with sunrise at 6:00 and sunset at 18:00

It should be b, the difference in the height of the sun at noon indicates that the position of the direct point of the sun on the earth is constantly changing, thus forming the change of seasons.

The four seasons are divided according to the length of day and night and the change in the height of the sun at noon!!

According to the "dam converges in the downstream direction and diverges in the upstream direction." You can get the answer to the first question.

It is certainly impossible to form one or four first. Because the formation of a riverbed sand bar is equivalent to an artificial dam, blocking the water. Then the 1 position will not be able to obtain sediment, and the sand bar will not be formed!

Because the lateral creep occurs in a pulsating manner rather than continuously and uniformly, the riverbed sand bar on the outer edge of the convex bank beach increases continuously when the lateral erosion of the bay is slow. When the lateral erosion accelerates, the convex shore shore grows rapidly. If the lateral erosion slows down again, a relatively high riverbed sand bar will appear at the new position on the outer edge of the convex bank.

The information in the question tells us that in order to form a roundabout fan, there must be a change in hydrodynamic action, and it is a lateral erosion effect, and there is only the second one that meets!

The nearest route from San Francisco to Shanghai is to cross the Pacific Ocean westward, which is simply a westward journey against the direction of the Earth's rotation.

The cycle of day and night is 360 degrees 15 degrees per hour (this is the angular velocity of the earth) = 24 hours, and the angular velocity of westbound should be reduced.

The true alternation of the Earth = 360 (15-relative angular velocity when going west) so the day-night alternation is less than 24 hours, i.e. c

c Just take the time.

2nd Floor: The difference between Beijing and New York is eight times apart, and San Francisco is in the western United States, so it's less than one Perseverance Day, and in fact, the difference between Perseverance Day and Solar Day is not much.

The actual time it takes for the Earth to rotate once, or the time it takes for the equinox to pass through the same meridian twice, that is, the time it takes for a star to pass through the same meridian twice. One sidereal day is equal to 23 hours, 56 minutes and 4 seconds.

The year is a leap year, with February 29, 2000, and after 45 hours at 23:00 Beijing time on February 28, 2000, it is 20:00 on March 1, 2000, that is, at 20:00 on March 1, 2000 in the East Eighth District.

2.The research ship sailed 900 nautical miles east on the equator, i.e. 900 * 1 ° = on the equator

The research ship sailed about 15° east

Therefore, the longitude of the location of the research ship is about 165°W, that is, the West 11th District 3According to the calculation method of "adding different sides", it can be seen that the difference between the East 8th Zone and the West 11th Zone is 19 hours, and the West Time Zone is later than the East Time Zone.

Therefore, the area where the research ship was located at this time was 1 o'clock on March 1, 2000.

Beijing belongs to the East Eighth District, 2000 is a leap year with 29 days, 28 23 o'clock departure, 45 hours later on March 1 20 o'clock, 2The length of a longitude on the equator is about 111 km 900 * km, and the km is about 15 degrees of longitude, 3The ship crosses the date line from the 12th East Zone to the east, 15 degrees longitude should be the 11th West Zone, 4

East plus west minus, 20:00 on March 1 - (8+11) = 1:00 on March 1.

location: location, positioning.

n 41°00 : 41 degrees 00 minutes north latitude (i.e. 41 degrees north latitude) e 86°00 : 86 degrees east longitude.

elevation: Elevation.

1919m (elevation of the above location: 1919m).

Location: 41°N, 86°E, 1919 meters above sea level.

Location: 86 degrees east longitude.

41 degrees north latitude.

1919 meters above sea level.

That is: 41 degrees 00 minutes north latitude, 86 degrees 00 minutes east longitude.

A is false, Hainan Island is located in the tropics, with strong solar radiation, not atmospheric circulation; B wrong, the altitude of Lushan is relatively high, every 100 meters the temperature drops, of course the mountain is cool in summer, it is a topographic factor, not the location of the sea and land, c right, the ground condition refers to the geographical location and terrain of two aspects, the Turpan Basin is the highest temperature in summer in China, the geographical location is due to being located in the interior of the continent, the typical continental climate leads to a hot and dry climate, the topography is due to the Turpan Basin is the lowest basin in China, the altitude is minus 115 meters, the lower the terrain, the higher the temperature, so c right, DFalse, the reason why the Qinghai-Tibet Plateau is the lowest summer temperature in China is because of the high altitude, which is due to topography, not atmospheric circulation

1.Turkey is not in the Mediterranean.

2.The southeast of Arabia is rich in oil, there are more people, and the urban heat effect occurs, and the southeast part of the country is rainy in winter and less rainy in summer, forming a Mediterranean-style climate.

3.Western India produces oil, and oil is lighter than water, so the oil is on top and the water is below, so there is drought and little rain.

4.Northeast Asia is close to Japan, and there are many Japanese people, so the sea breeze blowing from the Bering Strait is a Japanese warm current, because the sea breeze increases rainfall, and the ocean climate is formed.

5.(1).The climate is pleasant (2).Scenic scenery (3).Abundant water sources (4).Convenient transportation(5).There is a lot of vegetation, in short, suitable for human life.

6.Countries with faster economic development are located in (manned) zones.

7.Well, this is a good question, or it will have to be related to the whole of Asia.

1.During the Ming and Qing dynasties, the feudal monarchs implemented the policy of closing the country, although reducing the disadvantages of foreign countries, but the national economy could not grow, the Qing Dynasty's closed country was the most serious, during which Britain and other countries carried out the second industrial revolution, so that the gap between the country and Britain and other countries increased.

2.Since the Spring and Autumn Period and the Warring States Period, China has once again suppressed commerce, resulting in the formation of a small-scale peasant economy in China, so that the bourgeoisie germinated late.

Well, I should just know about these two points in Asia, and other countries are either too poor because of the large number of people, or the industrial revolution is too late or there is no industrial revolution.

The three curves in the figure represent the average temperature in July, the annual precipitation and the average temperature in January, so the annual precipitation in this region is more than 1000 mm, and the average temperature in January is more than 0 degrees, which is located in the southern region of China.

On the summer solstice, the sun shines directly on the Tropic of Capricorn, and the sunrise is earlier and the days are longer the further north you go, so the sunrise time and day length are later and shorter in this area compared with Harbin.

Answer: DLate Shorter.