A、副边电压变化率<img src="http://s3.qsxt.info/exams/201906/e8747733-c134-46b8-9c3e-88f7c603bd06.png"/>越大，效率越高
B、副边电压变化率<img src="http://s3.qsxt.info/exams/201906/e8747733-c134-46b8-9c3e-88f7c603bd06.png"/>越大，效率越低
C、副边电压变化率<img src="http://s3.qsxt.info/exams/201906/e8747733-c134-46b8-9c3e-88f7c603bd06.png"/>越小，效率越高
D、副边电压变化率<img src="http://s3.qsxt.info/exams/201906/e8747733-c134-46b8-9c3e-88f7c603bd06.png"/>越小，效率越低