One of a set of parallel geometric figures , such as lines or planes 平行线,平行面如直线或平面等一组平行的几何图形之一
Thermal insulating products for building applications . determination of tensile strength parallel to faces 建筑物绝热产品.平行面抗拉强度测定
Transmission systems - parallel - plate optical waveguide , modes ( ray and wave - optics methods ) 15 14光传导系统?平行面光导,模(辐射与波动光学) 。
The perpendicular distance from the base of a geometric figure to the opposite vertex , parallel side , or parallel surface 顶垂线,高线从一个几何形体的底边到相对的顶点、平行边或平行面的垂直距离