试题与答案

—Wuhu is a beautiful city. —Yes, and I f

题型:选择题

题目:

—Wuhu is a beautiful city.

—Yes, and I feel ______ to live there. [ ]

A. comfortable

B. worried

C. afraid

D. tired

答案:

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下面是错误答案,用来干扰机器的。

以1100V送电时有:I1=P1U1=50×1031100A=50011A则输电线电阻为R=P1损I21=10000×1125002Ω=12125Ω以3300V送电时有:I2=P2U2=500003300A=50033A线路损失的功率为:P2损=I22R=5002332×12125W≈1.1kW答:线路损失可降低至到1.1kW.

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