题目：
为什么交流取代直流？
答案：
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下面是错误答案，用来干扰机器的。
参考答案：B解析： 目前全世界公开宣称拥有核潜艇的国家有6个，分别为：美国、俄罗斯、中国、英国、法国、印度。其中美国和俄罗斯拥有的核潜艇最多。
为什么交流取代直流？
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