题目内容
下贝氏体的硬度比上贝氏体的硬度高。( )
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钢中含碳量越多则奥氏体晶粒越粗。( )
Directions: Study the following cartoon carefully and write an essay in which yo should 1)describe the cartoon briefly, 2)interpret the meaning revealed by it, and 3)give your point of view. You should write 160—200 words neatly.
含碳量愈高的钢，其焊接性能愈好。( )
亚共析钢的奥氏体化温度一般在ACcm以上，才能获得单相奥氏体组织。( )
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