641.ZP·W1-18型无绝缘移频自动闭塞,站内发送盒报警电压()。[321030201]
A.(A)AC18.3V～25.0V
B.(B)DC20.0V～27.0V
C.(C)AC23.0V～29.0V
D.(D)DC25.0V～30.0V
正确答案是B
641.ZP·W1-18型无绝缘移频自动闭塞,站内发送盒报警电压()。[321030201]
A.(A)AC18.3V～25.0V
B.(B)DC20.0V～27.0V
C.(C)AC23.0V～29.0V
D.(D)DC25.0V～30.0V
正确答案是B