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【单选题】
据报道，放射性同位素钬( 166 67 Ho)可有效地治疗肝癌，该同位素原子的核内中子数与核外电子数之差是A.
166
B.
67
C.
99
D.
32
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B.
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C.
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D.
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A.
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B.
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C.
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D.
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