It is difficult to detect the absolute density of rock by ct image in quantitative analysis of rock damage process in compression.
用CT图像定量分析岩石受力损伤破坏过程的难点，是难以知道岩石内部的绝对密度变化量。
The difficulties in adopting hydraulic transport for the converter sludge, which is of great absolute density and abrades the equipment, and its countermeasures have been introduced.
介绍水力输送重度较大且容易磨损设备的转炉污泥时的困难和采取的具体措施。
Methods: Absolute density method by improved LJ culture.
方法：改良罗氏培养基绝对浓度法。
Methods: Absolute density method by improved LJ culture.
方法：改良罗氏培养基绝对浓度法。
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