题目内容

High carbon steel may be ____________________(harden) by heating it to a certain temperature and then quickly cooling in water.

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Heat-resistant steel is made by ________________(add) some tungsten and molybdenum.

————（heat） it to a certain temperature and then quickly cooling in water may harden high carbon steel.

翻译下面术语（文中重点）1.carbon steel 2.alloy steel 3. high-speed steel 4. stainless steel 5.heat-resistant steel

翻译下面句子Heating it to a certain temperature and then quickly cooling in water may harden high carbon steel.