纱支密度达200针以上
结果表明，魏氏组织针由多个块状的亚晶粒组成，亚晶粒边界由位错缠结而成，在亚晶粒内有较高的位错密度；
The results show that Widmansttten structure needle consists of many blocky subgrains that have higher dislocation density and subgrain boundary is made up of dislocation tangle.
大针茅草原虻幼虫的年际间密度变化、垂直与水平分布和年度的季节动态等在典型草原区具有代表性。
The annual and the seasonal change of density and the vertical and level distribution of the Tabanidae in the Stipa grandis steppe is typical example in the typical steppe.
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