A damaged check valve can be immediately checked and replaced, thereby achieving obvious result in preventing the liquid from returning into the oil Wells.

对损坏的单流阀能进行及时的检查、更换，对油井防倒灌效果明显。

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These almost always provide a minimal single-user environment that you can use to run disk checks (FSCK), check for system compromises, or restore damaged files from backup.

它们通常提供了最基本的单用户环境，您可以使用这个环境进行磁盘检查(fsck)、系统安全漏洞检查，或者从备份恢复受损的文件。

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But sometimes can not use visual way to check whether the damaged, we can use some professional tools for error detection.

但有的时候无法用目测的方式检查是否受损，我们可以通过一些专业的检测工具进行检差。

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