电梯覆盖中兼容3G的板状定向天线安装在电梯井道内通常可以覆盖基层电梯井（）。
A.1-2层
B.2-3层
C.4-5层
D.8-9层
参考答案：C
If I had had enough time,I my work. [ ]
A. would finish
B.must have finished
C. would have finished
D.had finished
基坑变形有哪些表现？
