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单选题 Why is regular overhaul and routine maintenance necessary for railway vehicles

A. To enhance the aesthetic appeal of the vehicles

B. To prevent wear and tear,cracking,and deformations during operation

C. To increase the speed and efficiency of the trains

D. To change the color and design of the vehicles regularly

行业英语-铁路课程封面

学科:行业英语-铁路

时间:2025-06-21 15:55:02

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