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热轧钢材的冷却有什么意义？

答案

参考答案：

热轧钢材的终轧温度均为800～900℃，通过不同的速度或过冷度冷却到室温，会得到不同的组织结构和性能。所以冷却过程实质上是利用轧制余热的热处理过程，对钢材质量有很大影响。

完形填空

Levi Strauss was born in 1829 in Germany.He was the fifth of six children.In 1845，his father died.All six children decided 小题1:________(go) to the United States.Strauss went to the southeastern part of the US.For eight years，he walked along the country roads 小题2:________(sell) dry goods from door to door—just like his father in Germany.

In 1853，Strauss decided to move to San Francisco，小题3:______thousands of people were looking for gold. 小题4:_______his way to California，Strauss sold almost all of his dry goods.He had only one thing小题5:________(leave)some canvas (帆布)．

In California，Strauss tried to sell the canvas to the gold miners.He said they could make tents from the canvas.But they weren’t 小题6:_______(interest) in canvas for tents.Strauss didn’t know 小题7:_______to do with the canvas.Before long Strauss found the miners needed new pants.There were holes in their pants 小题8:______the cloth wasn’t strong.He decided to make the canvas 小题9:_______pants.They called them “Levi’s”．Later, Strauss stopped using canvas and used a different cloth.It was a heavy cotton cloth—the same kind people wear today.

Levi Strauss died in 1902.He never married and left money to his nephews.He left the world much more—the jeans 小题10:________so many people wear.
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填空题

不稳定物质（）时，若温度超过某一极限值，则有可能发生分解爆炸。
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