人行道顶面一般均铺设20 mm厚( )作为间层，并做成倾向桥面1%的排水横坡。
A．水泥砂浆 B．混合砂浆C．建筑砂浆 D．防水混凝土
参考答案：A
With the development of science, more new technology ______to the field of IT.
A．has introduced
B．is being introduced
C．is introduced
D．was introduced
日餐的进餐形式
