本题目来源于试卷: Physics Unit18: Electric Currents，类别为 通用国际物理
[单选题]
The monthly (30 daysjx) e;cbqh 3n(2h1ji x) ej6sabf4vv81m4yro ,zt28 cd slectric bill included the cost of running a central air-conditioning unit for 2.0 hr/day at 5000 W, and a series connection of ten 60 W light bulbs for 5.0 hr/day. How much did these items contribute tojsva z 4y6t84mcdov,2bf1 s r8 the cost of the monthly electric bill if electricity costs 8.0 cents per kWh?
A. $21.30
B. $31.20
C. $13.20
D. $12.30
参考答案: B
本题详细解析:
暂无
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