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二年级科学上册2.2《不同材料的餐具》课件教科版.ppt

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不同材料的餐具,炊具、餐具古代到现代的演变,不锈钢锅,酒樽,玻璃酒杯,鼎,现代炊具,刀、叉、勺等,精美的瓷器餐具,各种材料都有什么特点？我们如何知道呢？,对这些餐具进行观察,做“神秘的盒子”游戏。我们只能描述餐具或材料的特点，教师回答“是”或“不是”，最后猜出盒子里的餐具。,四种材料各有什么特点？,四种材料做的勺子和碗各有什么优点和缺点？,拓展,你还知道哪些物品可以用不同材料制成？,

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