随着粗骨料最大粒径的增大，骨料的空隙率及总表面积则随之均增大（级配良好）。
参考答案：错
I don't like to travel to big cities because it seems to me that one city is very much like___ ．
A．one
B．another
C．the other
D．others
下呼吸道包括( )
A．咽
B．喉
C．气管
D．支气管
E．支气管肺内分支
