简要说明系统维护的主要内容。
1.硬件设备的维护。 2.系统软件的维护。 3.应用软件的维护。 4.网络维护。 5.数据维护和运行环境//硬件维护由专职的硬件维护人员来负责,有两种类型:定期保养性维护、突发性故障维修。
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