Updated function names:pg_backup_start and pg_backup_stop in Chapter 10.
走进山西电力交易大厅，记者看到屏幕上实时显示火电出力量、风光发电量等数据。
，更多细节参见新收录的资料
ConclusionThese are the three broad categories of reactivity system that I’m familiar with — ones where a node gets updated by a signal from above, ones where a node gets updated on demand from below, and hybrid approaches6.
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