One metre of fabric is sufficient to cover the exterior of an 18-in-diameter hatbox...一米布足以包裹住直径为 18 英寸的帽盒。Then the fiber collimator is used to acquire parallel beam with appropriate diameter.单模光纤后接光纤准直器能得到我们所需要的合适光斑直径的平...
This hole was a scant .23 inches in diameter.这个洞眼的直径只有0.23英寸。the diameter of a tree trunk树干的直径A diameter passes through the center of a circle.直径从圆心穿过....