Polymorphism in elements is called allotropy . 把元素中的多晶现象称为同素异构性。
One determines a directionally dependent property in a polycrystalline specimen . 用多晶样品来测量有方向性的特征。
One may use a polycrystalline sample rather than a single crystal for many studies . 我们可以用一种多晶样品代替单晶进行多方面的研究。
The refractory metals and refractory metal silicides that are used to augment or replace the polysilicon are generally deposited by physical vapor deposition processes . 用于增强和取代多晶硅的难熔金属和难熔金属硅化物通常是用物理蒸发沉积工艺沉积的。
Preparation of polycrystal target material of la0 . 5sr0 . 5coo 3多晶靶材的制备研究