形容词 closed-ring:

1. having atoms linked by bonds represented in circular or triangular form

closedopenn.关开closedadj.关闭的；封闭的；停业的动词close的过去式和过去分词.closed control system闭环控制系统closed end acorn nuts铁盖袋帽closed topped housing闭口式机架closed-conduit flow暗渠流closed orthogonal set闭直交集closed circuit method闭式法,闭合式测定法Closed diaphragm wall闭合地下连续墙closed loop stability闭环稳定性closed mouth position闭口位[颞颌关节头照位]closed field magntron闭磁场