题目详情
单选题 How do flaw detection workers conduct regular "check-ups" on the rails
A. Combining the use of the flaw detector with drone inspection
B. Combining the use of large machinery with manual inspection
C. Combining the use of the flaw detector with manual inspection
D. Combining the use of large machinery with drone inspection

学科:行业英语-铁路
时间:2025-06-17 04:43:11
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