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【单选题】
标准煤亦称煤当量，具有统一的热值标准。我国规定每千克标准煤的热值为千卡。能源折标准煤系数等于某种能源实际热值（千卡/千克）除以7000（千卡/千克），原煤折标系数是0.7143，电力是1.229。（）A.
5000
B.
6000
C.
7000
D.
8000
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