Responsibility of the job: the installation of computer systems, maintenance, hardware upgrades, maintenance and repair, software upgrade maintenance.

工作职责：计算机系统的安装、维护，硬件的升级、维护及送修，软件的升级维护等。

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As your maintenance agreements come due, you can make informed decisions to renew, upgrade, or replace software.

随着维护协议到期，您可以明智地决定是续约、升级还是替换软件。

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The active seeker with software radio techniques has the merits of simple structure, high reliability, easy upgrade, easy maintenance and good anti-jamming capability.

采用软件无线电技术的雷达导引头具有结构简单、可靠性高、易于维护升级、抗干扰性能强等优点。

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