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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
Generators have generally two basic parts named "Stator" and "Rotor". Mechanical energy is provided to the rotor of a generaotor by means of a prime mover (i.e. a turbine). Turbines are of different types like steam turbine, water turbine, wind turbine etc. Mechanical energy can also be provided by IC engines or similar other sources.
14. In order to ensure the train operation safety and order, as far as possible not to stop delivery scheduling command, scheduling command wireless transmission system, the system should be used to value multiplied driver release scheduling command, is involved in running conductor, by the driver to operate the commander to convey; When the content and conditions of dispatching and dispatching orders are issued and conveyed by using the wireless dispatching communication equipment, the dispatch and dispatch order of the wireless dispatching communication equipment shall be applied. In the absence of the above conditions, there is a suspension station in this section, and the train dispatcher delivers the dispatch order at the stop station before entering the relationship interval; There is no stop in this section. The bureau may entrust the station with the station to forward the dispatching order to the operator and the operator. The entrusted office shall indicate to the entrusted authority the contents and specific vehicles of the dispatch and dispatching order, and the entrusted office shall not refuse the commission when the time permits. If the train is not in time, it must stop at the station before the train enters the relationship. The entrusted telephone shall have a good communication recording device.
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