A、采用电压等级交流50V、线芯的最小截面面积<img src="http://s3.qsxt.info/exams/201906/fcc18c94-e585-4465-9747-9c174354d00a.png" class="J_Pic_file-166 preview-img" style="font-size: 16px; display: inline;"/>的铜芯绝缘导线
B、采用电压等级交流250V、线芯的最小截面面积<img src="http://s3.qsxt.info/exams/201906/aa187cf9-1663-4788-96c3-3ba9c0cf355b.png" class="J_Pic_file-170 preview-img" style="font-size: 16px; display: inline;"/>的铜芯绝缘导线
C、采用电压等级交流380V、线芯的最小截面面积<img src="http://s3.qsxt.info/exams/201906/c32a368b-4aee-41d8-a3ea-acc1c3a0193f.png" class="J_Pic_file-174 preview-img" style="font-size: 16px; display: inline;"/>的铜芯绝缘导线
D、采用电压等级交流500V、线芯的最小截面面积<img src="http://s3.qsxt.info/exams/201906/c32a368b-4aee-41d8-a3ea-acc1c3a0193f.png" class="J_Pic_file-174 preview-img" style="font-size: 16px; display: inline;"/>的铜芯绝缘导线