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The railway bureau is required to issue a traffic dispatch order, which is formulated by the railway bureau.
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
Germany invited industry representatives, EU officials invite aviation experts to Berlin to go over launching regulations for air travel. Iceland’s major air-ports were closed after shifting winds blew the ash cloud toward the Reykjavik the first time. The airspace closure lasting for the week because of the ash threat to flight creates the worst breakdown in civil aviation in Europe. Over 100000 flights were canceled. Airlines on target lose more fat than 2 billion dollars.
Nickel Cadmium and Nickel Metal Hydride types both have problems with what is known a memory effect, repeated partial discharge and recharge may cause battery to 'remember' the point where recharging usually starts, and hang this as its base point. This false empty cuts down on the amount of charge the device holds.
Also known as the sleeper plate circuit. It is a prestressed concrete sleeper plate, which is laid in a compacted bed, and the wires are filled with asphalt or other materials. The prestressed concrete sleeper plate is 55cm wide and twice as wide as the normal prestressed concrete sleeper, with the same length and thickness as the ordinary prestressed concrete sleeper (see color map). Therefore, the contact area between the wide sleeper and the daoist bed doubles the contact area between the normal sleeper and the daoist bed, thus reducing the pressure on the bed
Porsche's English logo used the surname of Ferdinand porsche, the founder of the German porsche company. The logo adopts the shield city emblem of Stuttgart, where the company is located. The word "PORSCHE" is at the top of the logo, indicating that the trademark is owned by PORSCHE design company; The "STUTTGART" in the logo is above the horse, indicating the headquarters of the company in STUTTGART. In the middle of the trademark is a horse, which indicates that Stuttgart is rich in a kind of famous horse; The upper left and lower right of the trademark are antler patterns, indicating that Stuttgart used to be a good place to hunt. Trademark upper right and lower left the yellow stripe on behalf of mature wheat color, refers to the grain and make it plentiful and black in the trademark represents fertile land, in the trademark red symbol of the wisdom of the people and for the love of nature, thus formed a deep, exquisite and delicate beautiful pastoral landscapes, shows porsche glorious past, the future of the company and indicate the porsche, porsche's sports car to excel.
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