Physics Unit16: Electric Charge and Electric Field (id: bb4d3bd12)

本题目来源于试卷: Physics Unit16: Electric Charge and Electric Field，类别为 国际高中通用物理

[单选题]
An atom has more electxa8k vbrq-b.bey l(9q3z-mla)x :d4 srons than proto0sp( 1 i64sztoa:9gneh,l u gtns. The atom is

A. a positive ion.
B. a negative ion.
C. a superconductor.
D. impossible.


参考答案:  B


本题详细解析: 暂无

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