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 days)snbujs5(yrjla34 *ty a9+op s. ej35p eyqsoh g p+ndgw23*f +7lectric bill included the cost of running a central air-conditioning unit for 3+p 2f gwsq dygh*+n7o2.0 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 to 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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