题目内容
The more carbon the steel contains and the ________________(quick) cooling is, the __________________(hard) it becomes.
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High carbon steel may be ____________________(harden) by heating it to a certain temperature and then quickly cooling in water.
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
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