盖板; 连接板; 炉衬修补; 修补炉衬; 镀锡薄板的斑点(A foundry would have two cupolas, each capable of melting 25 tonnes per hour; both may be in operation during the day and patched during the night ready for the next day's work. 一个铸造厂有两座化铁炉，每个化铁炉每小时化铁25 t, 白天两座炉子可以同时操作，晚上补炉为第二天工作做准备。)
An area of systems management that involves acquiring, testing and installing multiple patches code changes to an administered computer system in order to maintain up-to-date software and often to address security risk(Patch management tasks include the following: maintaining current knowledge of available patches; deciding what patches are appropriate for particular systems; ensuring that patches are installed properly; testing systems after installation; and documenting all associated procedures, such as specific configurations required. A number of products are available to automate patch management tasks. Patches are sometimes ineffective and can sometimes cause more problems than they fix. Patch management experts suggest that system administrators take simple steps to avoid problems, such as performing backups and testing patches on non-critical systems prior to installations. Patch management can be viewed as part of change management)
