The basibranchial bone of the second and the fourth gill arch form petioliform . the branches of the petioliform take shape arborescent and have ubisch process in the end 胡子鲇的鳃上器是由第二、第四对鳃弓基部的鳃骨向外突起形成柄部，柄部反复分支呈树枝状，其末端有球状突起。
4.
In fact in the die casting process , when the liquid metal have not solidified completely , in order to break arborescent structures which have already solidified and then proceed fine - crystal intensification , we apply a deforming force , so the mechanical properties of parts produced by liquid combination process of die casting and forging will be improved significantly 其实质就是在压铸基础上,待型腔中的液态金属还没有完全凝固时,立即施加一个变形力,打碎已经凝固的枝晶组织。铸锻双控成形工艺主要适合生产形状复杂和强度要求高的汽车零部件和其它结构件。
