无缝道岔作业当天，封锁路前每隔一段距离拆卸一根轨枕上的扣件。
参考答案：对
. It is said that in Australia there is more land than the government knows _______.
A．it what to do with
B．what to do it with
C．what to do with it
D．to do what with it
APU引气页面，方框内的引气压力显示，什么时候显示琥珀色（）
A.当ADIRS 1（大气数据/惯性基准系统1）不可用或选择关断（OFF）位
B.ECB数据无效或未被传送时
C.以上都对
