一半径为R的导体球表面的面电荷密度为σ,则在距球面R处的电场强度
A. σ/ε0
B. σ/2ε0
C. σ/4ε0
D. σ/8ε0
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A. Have a drink.
B. Meet a friend.
C. Visit a company.
D. Write a report.
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A. On television.
B. From a newspaper.
C. Through the Internet.
D. Over the radio.
[音频]
A. It snowed heavily.
B. It rained hard.
C. The wind was strong.
D. The fog was thick
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A. Close to her office.
B. In the city center.
C. Near the train station.
D. Away from the highway.