()是指零件加工表面上具有的较小间距和谷峰所组成的()几何形状特性。
A.表面粗糙度;客观
B.位置公差;微观
C.加工纹理;微观
D.表面粗糙度;微观
参考答案:D
简述偏头痛的诊断要点。
The boy made the same mistakes ________, which, of course, made his parents very angry.[ ]
A. over and over again
B. more or less
C. sooner or later
D. here and there