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For years, car and motorcycle enthusiasts have been replacing their standard steel wheels with larger alloy wheels and hubcaps. At a glance, it's easy to realise why these alloy wheels have grown to be quite popular. Not only do they feature a smoother ride than regular steel wheels, but also they look flashier and permit vehicles to square out. This trend hasn't been lost on manufacturers; even new SUVs, compact cars and vans are coming furnished with large and flashy alloy wheels.
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
Peugeot began its reign in motorsports since the start with the entering five cars for your Paris-Rouen Trials in 1894. These motorsport trials are largely thought to be the 1st motor sports competition. It was not until 1912 that Peugeot made its perhaps most obviously contribution to motor sports when one of several entered cars won the French Grand Prix. This winning Peugeot car was advanced and influential for later designs since the Peugeot featured a dual overhead cam configuration with four valves per cylinder. The Peugeot innovation made it in a way that the engines could possibly be smaller and kick out maximum horsepower versus depending upon larger heavier engines to obtain the desired horsepower.
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