specific gravity of wood substance [木] 木材真比重
·2,447,543篇论文数据，部分数据来源于NoteExpress
The broken - line graph of average values of families show evident differences in wood basic specific gravity and tracheid length between different regions.
家系均值折线图显示，不同地区木材的基本密度、管胞长度层次明显。
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