墙身水平防潮层的构造做法种类有（）
A、防水砂浆
B、水平防潮层
C、油毡防潮层
D、配筋混凝土防潮层
参考答案：A, C, D
When she returned back by abroad, she told us all about her experience as an illegal immigrant.
A．by
B．back
C．from
D．back from
股价指数期货最终所交割的是一定数量的股票。（）
