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【单选题】
在金属应变片式压力传感器的测量电桥中,有一个桥臂的电阻R4是可调的,其作用是_______。(桥路的输出为U)A.
调零，当压力为0时，U达最小值
B.
调零，当压力为0时，U达最大值
C.
调量程为压力满量程时，U达最大值
D.
当压力不变时，稳定电路输出
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A.
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