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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.
To issue a scheduling order for line and bifurcation speed limit, you must specify the mileage (including the stop line and the switch number) and the time. Issuing accident rescue orders, monthly construction plans or construction cables involving the speed limit of the relevant lines, bifurcation must indicate the mileage.
China's first production country, gradually developed into the world tire industry has been built all kinds of complete series of products of complete industrial system, and obtain a series of original innovation characteristics of international frontier technology progress. China's heavy-duty meridian has reached the advanced level of the world through high speed and high load test. The radial tyre of the sedan has achieved no inner tube, wide section, flat and high speed. The safety, energy conservation and environmental tyre of the international trend have been steadily pushed into the international market and gained recognition
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