1. In the Indexed Access Method, a method of indicating that a record or block is in use and is not available for another request. 
   在索引存取方法中，指明一个记录或数据块处于使用之中而且不再接受另一个使用请求的一种方法。
2. Stringent control was exercised to block new projects in processing industries and avoid redundance in low-level development. 
   严格控制新上加工工业项目，防止低水平重复建设。
3. In SNA, a data flow control command that is used to request permission to start a bracket. 
   系统网络体系结构（sna）中的一种数据流控制命令，用以请求允许开始一次按类通信。
4. That portion of a unit control block that contains a drive's context while the driver is waiting for a resource. A driver awaiting the processor resource has its fork block linked into the fork queue. 
   单元控制块的那一部分，该部分包括驱动程序上下文，而驱动程序正在等待资源。等待处理机资源的驱动程序具有链接到分叉队列的它的分叉块。
5. The number of measuring units from an arbitrary starting point in a record, area, or control block, to some other point. 
   以记录、区域或控制块中的任意起始点到另一个点之间的测量单位数。

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• 1. 请求控制块
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