How many kilometers is Mach 1 equal to? Why do aircraft use Mach to describe speed and how fast it is
One day, the animal kingdom held an all-around race, where in addition to rabbits and turtles, there were also animals of vastly different sizes, such as ants and elephants. At first, the competition went smoothly, but when everyone discussed which unit to use to display the speed of the animals, serious disagreements arose...
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The "Zheteng" airport is 75 kilometers away from the city center, and you need to take the high-speed rail first to catch a plane?
Lanzhou Zhongchuan International Airport is located on the land of Longyuan, surrounded by mountains. It is a fourth level airport with 119 destinations and 212 routes, with an annual passenger throughput of 15 million people, making it an important hub in the northwest region...
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The construction of the 40 meter aperture radio telescope in Changbai Mountain, China will form an "equivalent aperture" of 3800 kilometers
Source: China News NetworkBEIJING, Oct. 11 (Reporter Sun Zifa, Zheng Yingying) Following the launch of the construction of the Shigatse 40 meter radio telescope in mid September, the Shanghai Astronomical Observatory of the Chinese Academy of Sciences started the construction of the Changbai Mountain 40 meter radio telescope project on October 11...
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The coal seam is as thick as 1 kilometer and extends for thousands of kilometers! Is the world's largest coal field actually formed by plants?
Before reading this article, please click on "Follow" to facilitate discussion and sharing with you, and also to watch the next exciting article in a timely manner. Thank you very much for your attention!Coal, known as "black gold", is an important part of the world's energy landscape...
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The coal seam is 1 kilometer thick and spreads for thousands of kilometers! The world's large coalfields are formed by plants
The world's largest coal mine has always been a focal point in the fields of technology and geology. For these stunning coal mines, people have been speculating on how they were formed...
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29000 kilometers to repair 1500 lighthouses, planes cannot be seen clearly at night, and American style infrastructure is done as soon as it is said
Today, it is difficult for us to imagine what efforts humans have made in history to sail far.In the early 1920s, the State Post Bureau of the United States faced a very difficult problem...
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Guangdong Transportation Group collaborates with Baidu to release the first provincial-level digital base map of over 10000 kilometers in China
As a major transportation province, Guangdong plays an important role in China's modern transportation construction. Currently, the mileage of expressways in Guangdong Province has exceeded 11200 kilometers, ranking first in the country for 9 consecutive years...
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5 electric vehicles capable of running 200 kilometers without frequent charging, including brands such as Yadi and Tailing
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China has discovered thousands of kilometers of rare earth ore belts in the Himalayas. How can artificial intelligence assist in mining?
The the Himalayas is the highest mountain range in the world and one of the most difficult regions to explore on the earth.However, Chinese scientists have discovered a potential rare earth deposit here, with a length of 1000 kilometers, which may be the world's largest rare earth reserve...
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How big is the universe? The Weber Telescope, located 1.5 million kilometers away, sends back despairing photos
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Indonesia's Yawan High Speed Rail Joint Debugging and Trial Speed Reaches 350 kilometers per hour
Jakarta, June 23 (Reporter Li Peisong) - The comprehensive testing of the joint debugging and testing of Indonesia's Yawan high-speed railway reached a speed of 350 kilometers per hour for the first time on the 22nd, marking that the Yawan high-speed railway has reached the design speed standard and achieved the phased task goal of joint debugging and testing.Since the joint commissioning and test of Ya'an Wanzhou High speed Railway was officially started on May 22, China Railway International Corporation led China Railway Beijing Group Co...
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Scientists in China Achieve Quantum Key Distribution in Thousand Kilometers of Relay Free Fiber Optics
Hefei, May 29 (Reporter Xu Jing) -- Pan Jianwei and Zhang Qiang of the University of Science and Technology of China, together with Wang Xiangbin of Tsinghua University, Liu Yang of Jinan Institute of Quantum Technology, You Lixing and Zhang Weijun of the Shanghai Institute of Microsystems and Information Technology of the Chinese Academy of Sciences, have cooperated to achieve 1002km point-to-point long-distance quantum key distribution in optical fibers by developing technologies such as low crosstalk phase reference signal control and extremely low noise single photon detectors, Not only has it set a world record for fiber optic relay free quantum key distribution distance, but it also provides a solution for high-speed backbone links in intercity quantum communication. The relevant research results were recently published in the international academic journal "Physical Review Letters"...
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