当小行基地微机联锁系统故障不能开放小行基地信号灯，但联锁设备和监控设备良好时，列车占用转换轨的凭证为（）。
参考答案：电话记录号码
Doctor Zhang is a friend of mine who works in a ________ school.
A．famous German medical school
B．German famous medical school
C．medical German famous school
D．famous medical German school
钒矿砂;钒精矿
