不同年龄组的松质骨与皮质骨骨密度年丢失率无差异（P>0.05）。
The loss rate of BMC value was similar between cancellous bone and cortical bone (P > 0.05).
同时指出了松装密度对临界堆料高度的影响。
The effect of apparent density on the critical feed height is given as well.
同时指出了松装密度对临界堆料高度的影响。
The effect of apparent density on the critical feed height is given as well.
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