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Transformers do not actually make conversion between mechanical and electrical form, but they transfer electric power from one circuit to another circuit. They can decrease or increase the voltage while transferring the power without changing the frequency, but with the corresponding increase or decrease in the current. Transformers also belong to electrical machines.
After the construction has been completed, the train with the specified speed limit shall be designated.
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.
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