惠斯登电桥实验中，电阻箱R2无法准确读数，能否测出Rx？
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惠斯通电桥（又称单臂电桥）是一种可以精确测量电阻的仪器。图3－13所示是一个通用的惠斯通电桥。电阻R1，R2，R3，R4叫做电桥的四个臂，G为检流计，用以检查它所在的支路有无电流。当G无电流通过时，称电桥达到平衡。平衡时，四个臂的阻值满足一个简单的关系，利用这一关系就可测量电阻。直流单臂电桥的平衡条件是：对臂电阻的乘积相等。据此推测：四个桥臂中任何一个桥臂的电阻不能准确读出的话。将不能准确的计算出被测电阻。
希望我的回答可以帮到你。
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