A、<span style="font-family: 宋体;">自由电子</span><span style="font-family: 'Times New Roman';"> </span><span style="font-family: 宋体;"> </span><span style="font-family: 'Times New Roman';"> </span>
B、<span style="font-family: 宋体;">空穴</span>
C、<span style="font-family: 宋体;">某些五价元素</span><span style="font-family: 'Times New Roman';"> </span><span style="font-family: 宋体;"> </span>
D、<span style="font-family: 宋体;">某些三价元素</span>
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