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【单选题】
下列关于移频自动闭塞说法错误的是()A.
移频自动闭塞是一种频率调制式的自动闭塞
B.
移频自动闭塞以轨道电路微信号通道
C.
采用移频信号的形式传送高频控制信息
D.
移频自动闭塞实现对区间通过信号机显示的自动控制
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举一反三
【简答题】A) She isn’t going to change her major. B) She plans to major in tax law. C) She studies in the same school as her brother. D) She isn’t going to work in her brother’s firm.
【简答题】A．She wants to order some food. B．She is unhappy to work so long. C．She plans to have a day off. D．They will stop working.
【单选题】Why does the woman call the man?
A.
She wants to request a refund.
B.
She plans to deliver a package.
C.
She has not received her ticket.
D.
She needs to make a reservation.
【简答题】A．She doesn't like science fiction. B．She plans to attend the fair. C．She can't meet the man on Saturday. D．She has already seen the movie.
【简答题】插花造型的基本原则?
【简答题】轴针安全系统其基本结构为在气筒阀接头上增设两个大小不同______只有在______与_________两者完全相符合时,才能相互连接,由此可保证连接绝对正确。
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