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问题 多项选择题

以下传输系统中，在本地网的层面唯一命名的有：（）

A.MSAP传输系统

B.PDH传输系统

C.SDH传输系统

D.波分复用系统

答案

参考答案：A, B, C, D

单项选择题

With the publication of ________, Theodore Dreiser was launching himself upon a long career that would ultimately make him one of the most significant American writers of the school later known as literary naturalism.

A．Sister Carrie

B．The Titan

C．An American Tragedy

D．The Stoic
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问答题 简答题

旅客列车运行途中，发生机车与车辆分离时怎么办？
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