open surface meaning in Chinese

粗糙表面
开曲面

Study on fracture pattern of open surface - flaw in gabbro
辉长岩中张开型表面裂隙破裂模式研究
Electrically and thermally similar to type 410 , but is calendered under different conditions , which produce a strong , but more flexible and conformable sheet with open surface
和t410相比，电气同耐热性相似，分别在于压光时的情况不同，生产出强度高但柔软度好的制品。
In order to get the shade of the object , we must decide which is the open surface and which is the hidden surface , decide the line between the open surface and the hidden surface , and then draw the shade one by one
求作平面立体的阴影，首先要判别立体表面的阳面和阴面，从而确定阴线，也就是阳面和阴面的分界线，然后逐段作出阴线在投影面以及自身阳面上的落影。