问题
选择题
Have you studied working a group?[ ]
A. by, to
B. by, with
C. in, to 
D. in, with
答案
答案：B
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Have you studied working a group?[ ]
A. by, to
B. by, with
C. in, to
D. in, with
答案：B
可知，电阻与电压、电流都有关系
可知，电阻与导体的长度和横截面积都有关系