大家看看这个模型可以用在解决哪类问题上? $ r9 I) G3 T- ?/ j! t; A# l% hItems serviced according to a priority are subject to "aging in queue" (i.e., other items entering at higher priority may "hog" the server). A typical protocol to address this problem is to have items gain priority by periodically checking aggregate time on queue.