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题目详情

单选题 What are the two main parts of a railway tunnel

A. The superstructure and the substructure

B. The main structure and the auxiliary structure

C. The tunnel body and the tunnel portal

D. The drainage system and the ventilation equipment

行业英语-铁路课程封面

学科:行业英语-铁路

时间:2025-06-17 04:43:11

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