دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a symbol used to indicate the erosin situation of the tone on cone bit

n: a translucent amber-colored to almost black brittle friable resin obtained by chemical means from oleoresin, the dead wood of pine trees, or from tall oil and used in making varnish, paper, and soap. It is also used as a soldering flux.