He is appointed as the principal of this system project.

他被任命为这个系统工程的负责人。

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The principal org.apache.geronimo.security.realm.providers.GeronimoUserPrincipal with the name system is used as a default principal when a user is not authenticated.

名称为system的主体or g . apache . geronimo . security . realm . providers . GeronimoUserPrincipal在用户不进行认证时用作默认主体。

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This paper introduces the design of electro-mechanical shear instrument system, including shear instrument working principal, mechanical structure and control system that use PC and PLC as the core.

本文介绍了剪切仪的机电一体化系统的设计，包括剪切仪的工作原理、机械结构及以PC机和PLC(可编程控制器)为核心的控制系统的设计。

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Playoff PAC, which bills itself as the principal opposition to the BCS system, unveiled a new ad today showing how the BCS is fixed, as in rigged.

FORBES: Is The College Football BCS Fixed?