试题选项中所列图形符号表示能断开负荷开关为(____)。
A<img src="/tupian/shandong/dinghongjian/dinghongjian03.jpg"/>
B<img src="/tupian/shandong/dinghongjian/dinghongjian04.jpg"/>
C<img src="/tupian/shandong/dinghongjian/dinghongjian05.jpg"/>
D<img src="/tupian/shandong/dinghongjian/dinghongjian02.jpg"/>