价格就成为了饭店经营者唯一可以调节需求的手段。
弹性又称为相对导数，它在商品经济活动中有着广泛的应用，诸如用价格调节需求等。
Elasticity, also called relative derivation, is extensively applied in the activity of commodity economy , such as adjusting the demand with price.
该研究可为系统调度人员准确地把握机组的运行状态，恰当地取舍符合系统调节需求的机组提供依据。
The research can offer the gist for the system operators to learn the operating state of the units accurately and select the units correctly that can meet the system regulation demand.
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