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The Volkswagen Beetle is strong competitor of Mercedes Smart. It has a cute exterior design, with nice, curved lines, even though the interior features a multi-functional sport steering wheel, making the car all to easy to control, plus a comfortable back-seat with plenty of legroom, uncharacteristic for such vehicles. Its fuel economy is a little worse compared to the Smart, with 22 mpg/city and 31 mpg/highway, nevertheless the great security features and excellent design must be reason enough to draw young drivers.
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 main reason is frequently lack of concentration... you drive into the fuel station, and you're thinking of things to replace on dinner, or whether you'll be able to your following appointment by the due date, and the next thing you know, you've put several gallons of petrol inside your diesel tank. Another common cause of while using wrong fuel is the fact that newer kinds of diesel cars less complicated quieter plus more powerful that their predecessors. It is very all to easy to forget that you're not driving a petrol fuelled car, and earn what could be an expensive mistake. Another consideration is always that sometimes fuel pumps aren't clearly labelled, or a previous user has squeeze nozzle back in the wrong place, and that means you inadvertently complete with all the petrol as an alternative to diesel.
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