principal parameter meaning in English

主要参数

Electric heating food ovens - types and principal parameters
电热食品烤炉型式与主要参数
Electric heating food ovens - types and principal parameters
电热食品烤炉型式与主要参数
Types and principal parameters for driving axle in wheel type construction machinery
轮式工程机械驱动桥型式和基本参数
Types and principal parameters of planetery wheel reductor for driving axle in wheel type construction machinery
轮式工程机械驱动桥行星轮边减速器型式和基本参数
Types and principal parameters of main drive and differential assembly for driving axle in wheel type construction machinery
轮式工程机械驱动桥主减速器及差差速器总成型式和基本参数

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