The nucleus of the atom is composed of swiftly moving protons and neutrons that are held together by very strong forces.

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问题 The nucleus of the atom is composed of swiftly moving protons and neutrons that are held together by very strong forces.

选项 A、mixed
B、propelled
C、pounded
D、bound

答案D

解析聚在一起

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职称英语综合类B级

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