Note: For the great decrease of self-supplied water volume in 2002, the total volume of water supply reduced.
注：2002年自备水供水量减少较多，因此全市供水总量出现下降。
If you have a fairly reliable and constant, high-volume flow of water then an Alternating Current (AC) supply is a possibility.
如果你有一个相当可靠的水和持续不断的，体积流量然后一交流电流(AC)电源的可能性。
The volume of supply air to an underground water powerhouse is very large. Supplying air from the ceiling can save much space in the house. Studies it with scale model tests.
水电站地下主厂房的送风量很大，采用顶送风方式可避免大量占有用空间。
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