neutral surface meaning in English

不变面
中立面
中性面

He had learned to present a blank, neutral surface .
他学会了在外表上显得呆头呆脑，庸庸碌碌。
This plane is therefore called the neutral surface of the beam .
因此这个平面称为梁的中性面。
The obtained microspheres modified pla membranes with different surface characters were proved by scanning electronic microscopy ( sem ) , clsm and stability tests . cytocompatibility tests of the microspheres modified pla membranes showed that the cytocompatibility of modified pla membranes with positive charges was better than that of modified pla membranes with negative charges or neutral surface
扫描电镜( sem ) 、激光共聚焦显微镜( clsm )以及稳定性测试分析结果反映出采用表面截留法能成功制备得到具有不同表面性质的功能微球改性聚乳酸组织工程材料表面。