400-600-1123
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答案：
B
N是少于20
N的可能质因数有几个不同的值？
14n/60化简：7n/30； n 必须满足是30的倍数才可以保证14n/60是整数：所以n可以等于30 60 90 120 150 180
这些数的质因子为：2 3 5 全部都是2 3 5 那么只有3个
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