结果表明：在役焊接接头残余应力分布规律与常规焊接保持一致，符合管道焊接接头“内凸外凹”的变形机理，但在数值上差别较大。
Results show that distribution regularity of residual stress of in-service keeps coherent with routine welding, which measures up deformation mechanism of welding, but numeric value is different.
用于外齿轮加工的径向剃齿刀，其齿向曲线为内凹超越曲线，这给剃齿刀的刃磨带来了困难。
The tooth curve of a plunge shaving cutter for an external gear is a recess transcendental curve, so it is difficult to grind it.
凹槽位于螺丝头 上，嵌槽凹设于凹槽的底部中央，而凸缘位于凹槽的外周缘。
The flute is located on the screw head, and the inserting recess is located at outer circumference of the flute.
通过比较，得出各种方法的优劣，为车身覆盖件抗凹分析提供依据，也为车门等闭合件外板抗凹分析提供参考。
By comparison, get both good and bad methods, which provide the basis for body panel dent analysis, also provide a reference for doors and other closer dent analysis.
容器底部带凹斜，最低处开有一排水小孔，小孔外连一软管。
The bottom of the container has a concave and slant part, with the lowest position provided with a small hole, which is externally connected with a hose.
结果不同年龄组间除黄斑中心小凹、上、下方外环区、总黄斑体积外（P<0.05），其余部位差异均无显著性；
Results There were no statistically significant differences between age groups except for the foveola, superior outer ring, inferior outer ring and total macular volume (P<0.05);
凹板筛设于滚筒的外下侧并固定于机架上；
The horizontal fan is arranged on the frame at the lower side of the rolling tube.
凹板筛设于滚筒的外下侧并固定于机架上；
The horizontal fan is arranged on the frame at the lower side of the rolling tube.
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