單項(xiàng)選擇題駝峰推峰移頻機(jī)車信號(hào)系統(tǒng),當(dāng)信號(hào)移頻變換時(shí),機(jī)車顯示的應(yīng)變時(shí)間應(yīng)為()

A.1s~2s
B.2s~3s
C.2s~4s
D.3s~5s


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