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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.
Is a new type of ballastless track, with reinforced concrete slabs, and under the big board with emulsified asphalt cement mortar as the first adjustment layers (or overlay on a cushion of high molecular elastic material layer) consisting of orbit. This kind of track is suitable for stone roadbed or non - ballasted deck. The asphalt concrete bearing layer shall be installed on the soil foundation. This kind of track integrity is good, the line is stable, the maintenance workload is small, but the cost is high, the construction period is long. Japanese railways have been used in the Shinkansen
In 1981, car makers started assigning a unique, 17-character code to each vehicle that is built, which is often used for assorted purposes, but mostly for verifying the legitimacy of vehicles. Governments and law enforcement agencies apply it to identify stolen vehicles, and motorists demand it after they take their cars to some mechanic, plus its useful when choosing a second hand car, so that you can operate a vehicle history report. The insurance industry often uses vehicle identification numbers, too. VINs are generally engraved on aluminum plates, cast or stamped, like a bar code, or perhaps label form, plus they can be found on the car's steering column, doorjamb, driver's door, passenger side door, dashboard, as well as in a vehicle's maintenance book and title.
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