皮皮学，免费搜题
登录
搜题
【单选题】
25Hz相敏轨道电路在道床电阻最高,电源电压最高的条件下,用( )导线短路轨道电流区段的任一点时,轨道继电器的衔铁应可靠落下A.
0.006Ω
B.
0.06Ω
C.
0.6Ω
D.
6Ω
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】Ipconfig命令可用来查看和修改网络中 协议的有关配置。(2019年高考真题)
【单选题】Why do boys and girls in co-education have no illusion about each other?
A.
They live together and know each other too well.
B.
Years of living together at school dismiss such illusions.
C.
Co-education encourages them to have an healthy attitude toward life.
D.
They are familiar with each other's problems.