1、同心纹
...concentric gas lift valve 同心气举阀concentric groove 同心纹concentric insulated tubing 同心保温油管 ...
2、闭槽
...槽 trough; manger闭槽 concentric groove半闭槽 half closed slot ...
3、[电讯]闭纹
...concentric circles 同心圆concentric groove 闭纹concentric cable 同轴电缆 ...
4、闭纹
...concentric circles 同心圆concentric groove 闭纹concentric cable 同轴电缆 ...