DSC遇险呼叫与安全频率是() ["A、8291KHZ","B、8376.5KHZ","C、8414.5KHZ","D、8416KHZ"]
按地层的种类分为()。 ["硬岩盾构(TBM)","封闭式盾构","敞开式盾构"]
哪一种警告有最高优先权:(). ["A.LEVEL3","B.LEVEL2","C.LEVEL1","D.状态信息"]
利用DSC进行遇险通信,在高频上首选频率是() ["A、2174.5KHZ","B、8414.5KHZ","C、12577KHZ","D、4207.5KHZ"]
哪种故障被送至CFDS:(). ["A.仅独立故障","B.仅主故障","C.仅独立故障和主故障","D.所有故障"]
计算机的I/O设备与主机之间为什么要采用接口进行连接?