题型:单项选择题 列车运行中,装置距离显示区在机车越过信号机时的显示仍有余值,经过一段距离后才显示为零。这种零显示出现在信号机位置之后的误差称为()。A、过机误差B、滞后误差C、超前误差D、操作误差 查看答案
题型:选择题 The driver ____ all his pockets but still couldn't find the car key. [ ]A. got though B. passed through C. went through D. got along with 查看答案