服务程序的用法和样例：
例句
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子系统支持服务程序的路径选择或控制程序。此程序根据所有子系统支持服务功能的优先级提供多任务和控制支持。
The routing or controlling routines of Subsystem Support Services. This routine provides multitasking and control support, on a priority basis, for all Subsystem Support Services functions.
