The reason why he didn’t come to school was ill.
A. due to
B. that he fell
C. because he fell
D. because of falling
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采用分区防水的区段,注浆顺序为先进行()、再进行背贴止水带上花软管注浆、最后进行()。
He has been to Beijing. _________.
A. So have I
B. So am I
C. Neither have I
D. Neither am I
高处作业是指在坠落高度基准面()以上(含2m),有可能坠落的作业处进行的作业。高处作业可分为临边作业、洞口作业、悬空作业三大类。
A. 2m
B. 3m
C. 4 m
D. 5m
最冷月平均气温低于-15℃地区,对地下水的处理应以()为主。
A. 排
B. 堵
C. 截
D. 防