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At ordinary times, eustachian tube by extrusion and surrounding tissue in the export of nose pharynx ministry in closed state, but when the baby swallowing, chewing, sneezing, or crying, in order to maintain the balance of inside and outside the middle ear pressure, open eustachian tube is a moment. Because the baby's ear has not yet developed, eustachian tube is relatively short, low and flat, and position if you cross holding the baby, let him lie on your back with milk, milk bottle mouth open too large, bottles, vertical too straight, etc., are likely to cause the baby choking milk, and make the milk along the eustachian tube into the middle ear, induce otitis media.
From the viewpoint of traffic safety, it is important to have both winter as summer tyres using the proper groove depth and properties to match the weather conditions. When there is excess water or slush on the highway as well as the driving speed exceeds a specific limit, the tread pattern in the tyre no longer pushes aside the lake or slush from beneath the tyre. The feel between the tyre along with the road is going to be lost, therefore will the grip.
20 cycles each hour. The single acting hydraulic cylinders have drainage facility and top platform includes a smooth surface. The hearings on pivot points are self lubricating along with the hydraulic power pack inside table are provided with relief valve against overloading and compensated flow valve for controlled lowering speed. The electrical equipment is controlled by an electronic system that carries a low voltage transformer and thermal overload protection. A wide range of accessories can be found combined with lifts to accomplish even higher safety functions where conditions require.
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
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