弦面和径面抗剪强度，林分密度相对低的林分人工林赤松低于林分密度相对高的林分人工林赤松；
The shearing strength in tangential face and shearing strength in radial face of P. densiflora wood from the stand with low density were lower than those from the stand with high density.
这一方面是为了减小管线的阻力损失，另一方面是为了避免通径收缩后给机械清扫管线造成障碍。
This aspect is to reduce the pipeline pressure loss, the other is to avoid the path contraction obstacle to the mechanical cleaning pipelines.
黄花梨是中国的一种重要水果，果径和果面缺陷面积是黄花梨分级的两项关键指标。
Huanghua pear is an important fruit in China. The fruit diameter and surface defects are important indices in the classification of Huanghua pear.
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