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[单选题]
音频测长轨道电路在轨道电路开路时,用数字表从轨端测量直流电阻(不送电情况下),300m区段应大于()。
A.10Ω
B.15Ω
C.20Ω
D.25Ω
查看答案
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A.10Ω
B.15Ω
C.20Ω
D.25Ω
A.40±4
B.46±4.6
C.55±5
D.55±5.5
A.400mA
B.500mA
C.600mA
D.700mA
A.400mA
B.500mA
C.600mA
D.550mA
A.450mA
B.550mA
C.650mA
D.700mA