共 3 条
[1]
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[2]
Electricity explained:electricity in the United States..EIA;.http://www.eia.doe.gov/energyexplained/index.cfm?page=electricity_in_the_united_states#tab2.2011,
[3]
State electricity profiles2008..EIA;.http://large.stanford.edu/courses/2010/ph240/harting2/docs/sep2008.pdf.2011,

