通常，（）式的采光均匀度最差。
A.单侧采光
B.双侧采
C.天窗采光
D.混合采
参考答案：A
— Mr. Wang, whom would you rather ____ the important meeting?
— Tom. [ ]
A. have attend
B. have attended
C. having attend
D. have to attend
以层次模型建立的数据库系统，其主要代表是
A．DBTG
B．SQL
C．MIS
D．IMS
