دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: a reciprocating or a rotary pump that moves a measured quantity of liquid with each stroke of a piston or each revolution of vanes or gears. positive-pressure self-contained breathing apparatus (SCBA) n: a face mask and portable air tank used for the purpose of breathing in contaminated atmospheres.