WG-21A型无绝缘轨道电路自动闭塞(“N+1”系统),接收器落下门限( )。[332050203]

WG-21A型无绝缘轨道电路自动闭塞(“N+1”系统),接收器落下门限( )。[332050203]

A.(A)150mV±8mV

B.(B)160mV±8mV

C.(C)175mV±6mV

D.(D)205mV±6mV

正确答案是C