单项选择题
场景中修建该隧道及地下工程的正台阶环形开挖法的适用条件是()。
A.地层好,跨度≤8m
B.地层较差,跨度≤12m
C.地层差,跨度≤12m
D.地层差,跨度≤14m
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单项选择题
场景中进行喷锚加固支护该隧道施工时,喷射混凝土封闭开挖面应采用早强混凝土,喷射厚度宜为()。
A.50~100mm
B.100~150mm
C.150~200mm
D.200~250mm -
问答题
In a lottery a person may win a million dollars or more. What would be the advantages of winning a million dollars’? Would there be disadvantages? You should write a composition of no fewer than 120 words on the subject on the Answer Sheet. -
单项选择题
北京市中关村科技园区的首要区位优势是( )
A.交通便利,通信发达
B.强有力的政策支持
C.高等院校和科研院所密集
D.与金融和商业中心相邻
