变压器标准变化的标幺制下列式子正确的是()。
A.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0525/1590398735993220.png" />
B.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0525/1590398757832860.png" />
C.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0525/1590398774806931.png" />
D.[img src="http://img.haodaxue.net/uploadimg/ico/2020/0525/1590398792661392.png" />
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正确答案： B 答案分析：无
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