“Water heating makes up anywhere from 15 to 25 percent of the annual energy usage in a home, ” says Steve Koep, a regional sales manager for Marathon water heaters.
This article utilizes the Grey theory to predict the annual power usage of one certain region, based on the power usage data of this region from 1997 to 2007.
本文根据我国某地区1997 ~ 2007年每年用电量数据，运用灰色理论，预测该地区每年的用电量。
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The lack of valid credit card is due to the low rate of revolving credit usage, low commission rate from merchants and annual fee waiver policy;