防水砂浆常用于地下室、水塔等需抹防水层的部位。( )
参考答案：对
统计数据按其收集方法可分为()。
A.分类数据
B.顺序数据
C.观测数据
D.实验数据
E.数值数据
Entering the bookstore, I noticed a girl _______ against the window, with her eyes_____ on her book in hand.
A．leaning; fixed
B．leaned; fixing
C．leaned; fixed
D．leaning; fixing
