double O-ring seal翻译;双O形圈密封
double closed-ring construction双闭环结构
Double floating-ring bearing双浮环轴承
double O-ring rubber seal翻译;橡胶双O型环密封英语
double split-ring resonator pairs双环开口谐振环对
double-ring one双环模型
double-ring control双环控制
double-ring reducer双环减速器