题目：
变压器做负载试验如果受设备限制时，可以施加不小于相应额定电流的（），测得的负载损耗应乘以额定电流对试验电流之比的（）。（）
A.50%.平方
B.25%.立方
C.50%.一次方
D.25%.平方
答案：
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变压器做负载试验如果受设备限制时，可以施加不小于相应额定电流的（），测得的负载损耗应
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