因此，必须采用烧结性良好的UO_2粉末和合适的成型烧结条件以使开口孔隙度和细孔隙度降至最低。
So that, it is necessary to adopt very sinterable UO2 powder and suitable pelleting and sintering conditions to minimize open porosity and small porosity.
采用U_3O_8添加剂可改善芯块微观结构，但同时使芯块密度下降，开口孔隙度增加进而导致吸湿加剧。
The use of U3O8 additive can improve the pellet microstructure, but result in decrease of pellet density and increase of open porosity, which contributes strongly to moisture.
指出目数、孔隙容量和网目开口能确切反映出筛网的印花特性，因而在选择印花筛网时是极为重要的参数。
It indicates that mesh, opening capacity and mesh opening can exactly mirror screen-printing features, thus constituting the important parameters regarding the selection of printing screens.
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