利用大盆等估算北京13日降雪672万吨<br><br><br>张亦驰、崔鸣歧、史博文等7名小朋友准备了大盆、塑料桶、笤帚、记录本、软尺等工具。他们在家长的帮助下，在小区的雪地上用软尺量出一个长2.4米、宽2米的长方形区域。上午11点多，雪停后，小朋友们很快测量出雪的厚度,herve leger red dress，"这雪有16厘米厚，像床大棉被！"由于第一次画的范围太大，洗澡盆装不下那么多的雪，最后他们只量了1米见方区域，然后把雪装进了大盆，经过称重,herve leger sale，发现1平方米雪的重量约4公斤,herve leger white dress。<br><br><br> 小朋友们根据北京市土地面积约16800平方公里,herve leger australia，每1平方米4公斤的数据,herve leger pink dress，最终得出北京昨天下雪672万吨。<br><br><br> 家长们表示，这种计算确实可能会有误差，但通过实践活动，能让孩子更好地学会如何去分析问题。<br><br><br>北京市气象台高级工程师张明英说，关于降水量的计算，专业方法也是在固定面积内、使用一定标准的容器收集降雪，待雪融化后测量出量度。不过专业测量对容器要求很严格,herve leger dress，需使用专用工具――雨量筒,discount herve leger dresses，其边缘要求绝对整齐,herve leger，以保证容器准确的面积，孩子们使用大盆显然不行,herve leger dress sale。<br><br><br>herve leger is very famous brand from frence which is founded in 1985. the herve leger style is committed to shaping women's figure and showing off a sence of women's femininity. every woman or girl is eager to own herself some herve leger dresses. the herve leger bandage bandage Dress is creatively designed that every cut is close to the body,bandage dress, carving out the perfect female body. thus it is imaginatively called bandage costume whether you walking on red carpet at the ceremony or participating in town meeting,herve leger bandage bandage Dress will creat a memorable image for you. Related articles：
发表评论 评论 (0 个评论)