It has a built-in electric motor which can open or close the umbrella on demand.
它有一个可以根据需要开合雨伞的内置电动马达。
Direct load control is an important content in the electric power demand side management.
在电力需求侧管理中，直接负荷控制是其重要内容。
The system dynamics are applied in the medium long term electric power demand forecasting.
介绍将系统动力学方法运用于电力需求量的中长期预测中。
Prospect of power demand side management in Anhui Electric Power Grid;
可中断负荷管理是一项有效的电力需求侧管理措施。
Prospect of power demand side management in Anhui Electric Power Grid;
可中断负荷管理是一项有效的电力需求侧管理措施。
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