欲了解窗外遮光物是否影响室内采光（）
A．采光系数
B．入射角
C．开角
D．自然照度系数
E．人工照度
参考答案：C
It was（）of you not to play the piano while I was having a sleep.
A.considerate
B.careful
C.considering
D.considerable
污水汽提装置设计规模为（）万吨/年。
A.80
B.90
C.100
D.110
