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【简答题】
最适于淬火的钢，是其碳量在0.9%左右的钢；含碳量小于0.4%的钢，其淬火效果不明显，故一般含碳量小于0.2%的钢，都不做淬火处理。但含碳过多的钢，淬火后钢太脆。
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举一反三
【简答题】Henry Manley had no idea at all why George wanted to see him.
【简答题】I wanted to know when they__________come to see me.
【简答题】1889 年( )颁布了“技术教育法”。
【单选题】Why did Ted and Grace invite their friends to their house?
A.
They wanted them to see their new car.
B.
They wanted to see the children.
C.
They wanted to show them the movies which had been taken when they visited China.
【简答题】The managers were discussing the plan which they all wanted to see _________ out that month.
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