利用等温回火实验，采集了淬火钢在不同条件下回火时的硬度数据。
The hardness data of quenched steel under different conditions were collected utilizing austempering tests.
本文将市区的浅层地下水硬度作为灰色量，用已有的硬度数据建立GM(1,1)灰色模型，预测其未来的变化趋势。
In this paper, the hardness of the shallow groundwater was treated as a grey variable and the GM (1, 1) grey model was created to predict the future trend of the change in hardness.
本文将市区的浅层地下水硬度作为灰色量，用已有的硬度数据建立GM(1,1)灰色模型，预测其未来的变化趋势。
In this paper, the hardness of the shallow groundwater was treated as a grey variable and the GM (1, 1) grey model was created to predict the future trend of the change in hardness.
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