ball sealing
短语词组
- ball face sealing structure 球面密封结构
- ball face sealing 球面密封
- ball head sealing 球头密封
- ball valve sealing structures 球阀密封结构
- Ball sealing support 球体密封支架
- gate valve for ball sealing 球面闸阀
- vacuum line sealing ball 真空管密封球
- metal hard sealing ball valve 金属硬密封球阀 返回 ball sealing