题目内容

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

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————（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.

翻译The more carbon the steel contains and the quicker the cooling is, the harder it becomes.