—Is this ________ ruler?

—Yes, it's her ruler.[ ]

A. your     

B. your sister's  

C. your brother's

平屋顶屋面雨水管的布置量与（）无关。

A.屋面集水面积大小

B.屋面坡度大小

C.每小时最大降雨量

D.排水管管径