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【单选题】
电子气泡式水平仪结构如下图所示,密封的玻璃管内充入导电液体,中间保留一个小气泡,玻璃管两端各引出一根不锈钢电极,在玻璃管中间对称位置的下方引出一个不锈钢公共电极。分析该水平气泡仪的工作原理,回答以下问题: 水平气泡仪结构简图 1- 被测平面 2- 导电水柱 3- 气泡 4- 密封玻璃管 5- 不锈钢电极 6- 公共电极 7- 外壳 当被测平面完全水平时,气泡应处于玻璃管的中间位置,左右两侧的不锈钢电极与公共电极之间的电阻值 R1=R2 。如果希望此时电桥的输出电压 Uo=0 ,则电阻 R1,R2,R3,R4 应满足( )条件。
A.
R3>R4
B.
R3
C.
R3=R4
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