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【单选题】
关于库仑定律的公式 F = k ,下列说法正确的是 ( ) 。A.
当真空中的两个点电荷间的距离 r →∞ 时，它们之间的静电力 F → 0
B.
当真空中的两个电荷间的距离 r → 0 时，它们之间的静电力 F →∞
C.
当真空中的两个电荷之间的距离 r →∞ 时，库仑定律的公式就不适用了
D.
当真空中的两个电荷之间的距离 r → 0 时，，它们之间的静电力 F →∞
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【单选题】What's the main idea of the passage?
A.
Online advertising is more effective than TV advertising.
B.
Google and Yahoo! are challenging Microsoft in the field of advertising.
C.
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D.
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【单选题】What's the main idea of the passage?
A.
online advertising is more effective than TV advertising.
B.
Google and Yahoo! are challenging Microsoft in the field of advertising.
C.
Google's new advertising service could make the internet an even more valuable marketing medium.
D.
online advertising is popular with advertisers.
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A.
online
B.
on cellphone
C.
in advertising
D.
in broadcasting
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