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。
Have a cut, mold, polishing, concave, deep carving and sandblasting the surface of a complete production line of laser engraving.
拥有切、模、抛光、打凹、表面喷砂深雕及激光内雕的完整生产流水线。
On seismic profile cross-cut the channel, it generally presents as a lenticle with flat top and concave bottom and has the character of infilling in reflection.
河道砂岩体在横切河道的地震剖面上一般表现为充填反射状的顶平底凹的单透镜体；
Taking pivot section and over-direct each section to the first and cut a triangular concave technique.
取定点放射分区，将发片带至第一片修剪三角反曲线层次。
Take diagonal section. Cut a triangular concave technique.
取斜向前偏垂直的分区剪三角反曲线层次。
By use of the method, the bigger one"s convex and concave of spiral bevel gears can be cut out one-through with few format of cutters, which can improve the efficiency of processing the gears."
利用此方法，用较少的刀具规格，可以将弧齿锥齿轮大轮的凸凹面一次性切出，提高制齿效率。
By use of the method, the bigger one"s convex and concave of spiral bevel gears can be cut out one-through with few format of cutters, which can improve the efficiency of processing the gears."
利用此方法，用较少的刀具规格，可以将弧齿锥齿轮大轮的凸凹面一次性切出，提高制齿效率。
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