杭州交通信息网简笔画长城手抄报图片:why lower the temperature of a hot-working process leads to fine grains?
来源：百度文库 编辑：杭州交通信息网 时间：2024/05/11 12:16:38
plz ans in english
The temperature of a hot-working process drops the more quickly,the more quantity of fine grains will be achived.The reason is that before the fine grains melt to each other and grow much bigger,they are frozen.
汗
why lower the temperature of a hot-working process leads to fine grains?
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