《建设工程质量管理条例》规定,()对施工中出现质量问题的建设工程或者竣工验收不合格的建设工程,应当负责返修。
A.建设单位
B.施工单位
C.设计单位
D.监理单位
参考答案:B
正方形ABCD,E为正方形对角线交点,将正方形ABCD沿对角线BD折起,使平面ABD⊥平面BCD,有如下四个结论:
①AB∥CD;②AC⊥BD;③△ACD是等边三角形;④平面AEC⊥平面BCD.其中正确的结论是______.
用括号内单词的适当形式填空。
1. The children are very _____ (excite) when they get a lot of presents.
2. There are so many _____ (build) that I can't find the right place.
3. My shoes are _____ (wear) out.
4. Congratulations on crossing the channel _____ (success)!
5. He's _____ (see) the film many times before.