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Prevent the baby from getting calcium, first of all to breastfeed. Feeding the mother needs 1,200 mg of calcium a day. In the summer, after the birth of the child, the outdoor activities can be started in January, each day for 1~2 times, gradually increasing from 10 minutes to 1 hour. Can properly right supplement the right amount of vitamin D, as the children gradually big, should pay attention to diet diversification, correct the bad habit of partial eclipse, eat more food containing calcium and vitamins, such as dried small shrimps, black fungus, ribs, milk, liver, etc. In addition, nowadays many parents blindly do trace element detection for their children, in fact, do not need to. Six months or more children, if physical growth are within the normal range, nutrition is normal, no frequent respiratory tract, intestinal infection, generally do not occur the lack of trace elements, not blindly to check.
Early pneumatic tyre, use is made of coated with rubber canvas when tire body, because the canvas ordinate and horizontal lines cross each other, due to the deformation of the tire when walking, lead to rub against each other, in this way, the line is easy to be ground breaking, the tires can only run 200-300 km. In 1903, Mr. J. f. palmer invented the twill textile, which led to the development of cross - layer tires, making the tyre life a big step forward. Because the tire of the skew fork will no longer cause friction because of the tread of the tyre, the cord will not be easily worn out, so the life span will be considerably longer. In 1930, Michelin made the first tyre without a tyre. The world famous meridian tire was invented in 1946. Therefore, the development of the tire has been a long journey, in this long night, I do not know how many generations have paid hard labor and excellent wisdom
Some algae species are 50% or more lipid oil by weight. This oil may be pressed from the algae and refined into diesel. The process for extracting algal oil, at its simplest level, resembles pressing an olive. Up to 75% from the oil might be squeezed from algae using a simple mechanical press. Hexane might be used being a solvent to raise extraction up to 95%. Once extracted, the oil is refined through transesterification. A catalyst including sodium hydroxide is combined with alcohol to make biodiesel and glycerol.
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