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

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

admin2012-07-29  76
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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