题目内容
列车运行，机车信号停电无显示，LKJ界面也无显示。
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列车运行，机车信号故障，列车限速为20km/h。
列车运行，机车信号故障，处理完成后，正常显示，列车恢复正常限速。
Lesson 8 背景知识听力填空[音频]Listen to the passage on introduction of Approach Control and then fill in the blanks with proper words based on what you have heard.According to this passage, there are 1 control positions working at Terminal Radar Approach Control Facility. They are 2 descent controller, 3 descent controller, 4 controller and 5 controller.The first control position hands off the aircraft to the second control position, and then the second hands it off to the third control position and so on.When the aircraft reaches about 50 miles outside the destination airport, the approach controller performs 6 and hands the aircraft off to the last control position. Once the arriving aircraft are within the airport’s airspace, they are handed off to the7 working in the airport’s control tower. The aircraft are then no longer being 8 by the controllers in the approach control.An approach control’s total airspace is 9 into small parts called 10 . The controllers in the Approach Control Facility direct the 11 of aircraft in and out of that airspace by12 a13 and maintaining 14 with pilots. When necessary, controllers also15 aircraft to avoid dangerous 16
对组织结构趋于扁平化论述正确的是（ ）
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