信号设备联锁关系的临时变更或停止使用，须经哪儿批准？

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问题问答题简答题

答案

参考答案：须经铁路局批准。

填空题

用所给词的适当形式填空.

1. I _______ (grow) up in the countryside.

2. Jane prefers _______ (cycle).

3. Running can help you keep _______ (health).

4. Xiao Ming broke the men 800-meter-race _______ (record) at the school sports meeting.

5. Ann is going to go _______ (skate) with her classmates tomorrow.

填空题

一棵二叉树第六层(根结点为第一层)的结点数最多为【】个。