【单选题】【消耗次数：1】
当变压器的电压比大于1 时，变压器为( )。
①
升压变压器
②
加压变压器
③
降压变压器
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相关题目
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自耦变压器的绕组容量与变压器容量的关系是（）。
①
<imgwidth="279"height="113"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD25960.png">
②
<imgwidth="235"height="60"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD26076.png">
③
<imgwidth="273"height="113"src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTD.files/DJYTD26191.png">
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