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????????????????????????????????????????????????????????????43%???????????75%?
?:?100????,75w/?????????????????:20??,????:3.2?/??,?????20*3.2*30=1920?;?????????:56kW/h(??????????3.2),????:0.65?/kW/h,????56*0,65*30=1092?, ????:(1920-1092)/1920=43%