某段铁路所有车站共发行20种普通车票，那么这段铁路共有车站数是�

某段铁路所有车站共发行20种普通车票，那么这段铁路共有车站数是（）

A．4 B．5 C．8 D．10

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某段铁路所有车站共发行20种普通车票，那么这段铁路共有车站数是�

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