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5岁,儿童的“膨胀期” · 1、不以儿童好恶提供饮食,保证其膳食平衡; · 2、避免进食过快和进餐次数过多; · 3、晚饭不要过量。
夏季,特别是在雷雨天气,闪电时,产生大量的热量(一般可达摄氏3万度),使得它周围空气的体积突然膨胀,因而引起巨大的雷声。雷电形成的瞬间,电流可达20~25万安培 ...
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