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问题
判断题
位于到发线的一组12号复式交分道岔与两组对向的单开道岔长度相等。
答案
参考答案:错
选择题
— Sorry, I've kept you waiting.
— It's all right. I _____ newspapers all the time.
A. am reading
B. had read
C. was reading
D. have been reading
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问答题 简答题
事故抢修补偿绳断线时怎么办?
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