單項(xiàng)選擇題集中監(jiān)測對25Hz軌道電路的監(jiān)測精度為()
A.±1%
B.±2%
C.±3%
D.±4%
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1.單項(xiàng)選擇題集中監(jiān)測對駝峰2.3軌道電路的監(jiān)測精度為()
A.±2%
B.±3%
C.±4%
D.±6%
2.單項(xiàng)選擇題集中監(jiān)測對外電網(wǎng)斷相、錯序、瞬間斷電開關(guān)量采樣周期為()
A.1s
B.50ms
C.250ms
D.4s