So it is very important to find out the variation regulation of wood ring density in growth process.
解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。
The feed regulation in ring rolling is researched on the basis of production of driven bevel gear blank in back bridge of EQ140 automobile in this paper.
本文结合EQ140汽车后桥从动伞齿轮辗扩实践，对环形件辗扩工艺的进给规范进行了研究。
The feed regulation in ring rolling is researched on the basis of production of driven bevel gear blank in back bridge of EQ140 automobile in this paper.
本文结合EQ140汽车后桥从动伞齿轮辗扩实践，对环形件辗扩工艺的进给规范进行了研究。
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