spring-loaded oil control ring
... 弹簧油封 spring-loaded oil seal 弹簧油环 spring-loaded oil control ring 弹簧预紧装置 spring preloading device ...
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短语
弹簧胀圈油环
conformable oil ring
;
spring expander oil ring
;
spring-backed oil ring
油环弹簧
oil ring spring
油环弹簧端
oil ring spring end
油环弹簧连接
oil ring spring joint