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2．任何带电体的电荷量总是基元电荷的整数倍，表明电荷是的。

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3．库仑定律的适用条件为：、、。

One of the appealing ______ of this new product is its artful appearance.

A. quality
B. actions
C. behaviors
D. traits

The biggest _________ of the entrepreneur's penchant to understand everything about nothing and a little bit about a lot of things is that they get bored quickly with any one task.

A. fault
B. downside
C. positive aspect
D. benefit

The plan was good, but it was badly ________.

A. played
B. behaved
C. executed
D. fulfilled