盾构贯通肖停机后清除洞口碴土，割除洞口最后的支撑结构，支撑结

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问题单项选择题

盾构贯通肖停机后清除洞口碴土，割除洞口最后的支撑结构，支撑结构切割顺序为（）。

A.先切割上部，后切割中部

B.先切割上部，后切割下部

C.先切割中部，后切割上部

D.先切割底部，后切割上部

答案

参考答案：D

填空题

根据汉语提示，结合句子意思，在横线上写出恰当的单词或词组。

1. Some people _______ (当作) the pets as their family members.

2. Next year the _______ (二十九) Olympic Games will be held in Beijing.

3. It is not easy for me to finish the work _______ (独自) in such a short time.

4. Thank you very much for sending me so many wonderful _______ (邮票).

5. Not many families can afford to send their children _______ (出国求学).

判断题

闭塞区间是指由信号机划分的办理闭塞或完成闭塞功能的区间。