置换

Diamonds and gemstones in setting by using bench pins, hammer, setting pliers, and gravers, This course enhance the stone setting techniques which enable Jewelers to incorporate diamonds and gemstones into production.

这项课程涵盖如何削弱使用适当的钻，加强钻石和宝石设置使用替补别针，锤子，钳子设置和严重，这当然加强石设置技术，使珠宝商把钻石和宝石投入生产。

Leaf blade abaxially puberulent; leaf ligule 1.5–3 mm.

叶片背面被微柔毛；叶叶舌1.5-3毫米 14 I。