The diameter of a sphere is four times the focal length of a concave mirror cut from it.
凹面镜如果是从圆球上切下来的，圆球的直径会是凹面镜焦距的四倍。
The calculating results showed that the optimized geometry of soldering fillet is a concave shape in which the extruding length of the soldering fillet is a little more than the gap height.
计算结果表明，钎缝圆角的最佳几何形状为钎缝伸出长度略大于钎缝高度的凹型。
The calculating results showed that the optimized geometry of soldering fillet is a concave shape in which the extruding length of the soldering fillet is a little more than the gap height.
计算结果表明，钎缝圆角的最佳几何形状为钎缝伸出长度略大于钎缝高度的凹型。
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