在用自组电桥测量电阻时,当 R S 调到R 1 时,检流计指针向右偏转5格, 调到 R 2 时,指针向右偏转9格,调到 R 3 时,指针向左偏转4格, 调到 R 4 时,指针向左偏转6格,则待测电阻 R X 的阻值在
A.
R 1 与 R 2 之间
B.
R 3 与 R 4 之间
C.
R 1 与 R 3 之间
D.
不能判断
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