|
Spacecraft flew hundreds of thousands to hundreds of millions of kilometers from the earth, injecting speed when the size and direction of a slight error, arrived at target planets will appear large deviation error, for example, when Mars probe injecting speed 1 m/s speed (about one over ten thousand), arrived at Mars, about 100000 km distance deviation. Therefore, precise control and navigation must be carried out during the long flight. Flying to the moon is usually controlled by the orbital control system of the ground and space probe (see orbit control). Interplanetary flight distances, radio signal transmission time is long, the real-time remote control, can't so planets and interplanetary spacecraft orbit control system shall have the ability of autonomous navigation (see interstellar travel navigation and control). The United States, for example, "pirates" spacecraft in space flight of more than eight hundred million km, for 11 months of 2000 times of autonomous orbit adjustment, the final surface to achieve a soft landing on Mars, placement accuracy up to 50 km. In addition, in order to ensure the accuracy of the orbit control engine, the communication antenna is always aimed at the earth, and other systems work normally, and the detector has the autonomous attitude control ability
The 1931 Bugatti Royale Kellner Coupe was recorded because most costly car ever. It was sold for $8,700,000 in 1987. Meanwhile, the Bugatti type 41, also referred to as Bugatti Royale, is now one of the rarest cars on the globe. Bugatti produced only 6 from originally planned 25, among them only 3 could find their buyers. However, these cars are certainly not indexed by top rarest and expensive cars on earth because they are certainly not available in the market nowadays. Following are 10 priciest and rarest cars on the market.
uncomfortable feelings." "Seven Liu Dama bed, you have high blood pressure, now with mannitol dehydrant, drips in 100 drops per minute or so, because of the high drug concentration, the number of drops quickly, your hand will feel very pain, as long as local don't swelling will be fine. In addition, after using this medicine, you have to take a lot of urine and urine amount, and when you get up and go to bed, you must slowly raise your head and lie down, so that you can feel more comfortable. What's the reaction? Tell the doctor at any time." "Eight bed yellow baby, you are good boy, two years old a bit more, eat for oneself. Now in the needle, hands and feet can't move. If the needle comes out, the needle's hand is swollen and it's about to get another shot. After listening to my aunt and mother, the needles will soon be over. As a nurse, I only take the time and opportunity to change in time for the patient potions, explain some considerations and health knowledge, obtain the patient very family trust, understanding and cooperation, various treatment and nursing measures to implement smoothly. Our nursing work will be done in a hurry to win everyone's satisfaction.
The traffic order of the passenger train without stop-point on the road may be issued by the relevant railway bureau directly to the terminals of the two terminals, the traffic (train) section.
New Car Buying Tips--


Copyright ?1998-2017 Technews Corp, All rights reserved
|
