Suppose that in each trial either electrons or protons had been added to each sphere to

外语类 专四考试 已帮助 人

Suppose that, in each trial, either electrons or protons had been added to each sphere to produce its charge. In Trial 3, which of the 2 types of particles would have been added to Sphere X, and which of the 2 types of particles would have been added to Sphere Y ?

A.electrons;protons

B.protons;electrons

C.electrons;electrons

D.protons;protons

请帮忙给出正确答案和分析,谢谢!

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