吊顶工程常见的质量问题有（）
A．吊顶龙骨起拱不均匀
B．面层变形
C．板面开裂
D．龙骨间距不含要求
参考答案：A, B, C
---What do you think has made Tom feel down?
---- ______ his seat in the election, I think.
A．As he lost
B．Lost
C．Losing
D．Because of losing
飞矾散功效与作用
