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1．曾参加起草独立宣言的美国政治活动家富兰克林，也对电学现象有深入的研究，发现了，发明了，研究了。

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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。

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