一个由2个串联电阻组成的电路图是(____)。
A图<img src="/tupian/shandong/jining/dgjc18.png"/>
B图<img src="/tupian/shandong/jining/dgjc19.png"/>
C图<img src="/tupian/shandong/jining/dgjc20.png"/>
D图<img src="/tupian/shandong/jining/dgjc21.png"/>
A图<img src="/tupian/shandong/jining/dgjc18.png"/>
B图<img src="/tupian/shandong/jining/dgjc19.png"/>
C图<img src="/tupian/shandong/jining/dgjc20.png"/>
D图<img src="/tupian/shandong/jining/dgjc21.png"/>