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【判断题】
高速断路器主要用于城市轨道交通车辆上,最为车辆电气系统的总开关和保护电器。当高速断路器闭合时,车辆将获得由受从接触网(或第三轨)引入的电源,使车辆得以投入工作;若车辆主电路或辅助电路发生短路、过载、接地等严重故障时,故障信号通过相关控制电路使高速断路器自动开断,切断车辆总电源,防止故障范围的扩大。A.
正确
B.
错误
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举一反三
【单选题】Section A Directions: In this section, you will hear 8 short conversations and 2 long conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the ...
A.
He can't recall where he left his portable computer.
B.
He's got a terrible headache and forgets things easily.
C.
He's some trouble with a company but can't get rid of it.
D.
He doesn't remember the name of the computer manufacturer.
【单选题】Which of the following is the best title for the passage?
A.
A Victim of Its Own Success
B.
Traditional and Modem Communication
C.
Unsatisfactory Wireless System
D.
Customer Service in Communication
【简答题】船壳外板的编号(PD6)表示( )
【简答题】Section B Directions: In this section, you will hear several conversations. At the end of each conversation, one or more questions will be asked about what was said. Both the conversations and the que...
【简答题】In the Ituri forest of America live many tribes，one of which is Pygmy. Most of the Pygmies in the tribe are not taller than four feet. They weigh only about eighty pounds each. In spite of their small...
【判断题】The American society as a whole operates on the basis of well-kept schedules.
A.
正确
B.
错误
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