Just as a double convex lens enlarges so a double concave lens reduces.
正象双凸透镜可以放大那样,双凹透镜也可以缩小。
Just AS a double convex lens enlarges, so a double concave lens reduces.
正象双凸透镜可以放大那样,双凹透镜也可以缩小。
Spherical roller bearings are double-row, self-containing units that comprise solid outer rings with a concave raceway, solid inner rings and barrel rollers with cages.
球面滚子轴承是双列,自我包含的单位,包括坚实的外圈与凹面滚,固体和内圈与辊每桶笼。
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