دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: any material (such as paper, cork, asbestos, or rubber) used to seal two essentially stationary surfaces.

n: any material can be used to seal airtight two fasten surface。For example ， paper 、softwood、asbestos 、rubber and so on。



any of several replaceable seals in equipment or tools.