单项选择题
A.8.17g/(kW2h) B.6.17g/(kW2h) C.5.17g/(kW2h) D.9.17g/(kW2h)
A.Ⅰ B.Ⅱ C.Ⅰ+Ⅱ D.Ⅱ+Ⅲ
A.75% B.85% C.90% D.95%