氧化沥青
参考答案：
以慢凝液体沥青为原料，采用氧化工艺得到的粘稠沥青为氧化沥青
A．声波是纵波
B．声波是横波
C．声波的波长较长
D．声波的波长较短
______ is often the case, Miss Wang was the first to get to school. [ ]
A. Which
B. What
C. As
D. It
