按路面结构的力学性能，路面分为哪三类？
参考答案：
柔性路面、刚性路面和半刚性路面。
Because he was _____ the new limit, he was stopped and wanted for speeding. [ ]
A. good at
B. tired from
C. unaware of
D. uninterested in
机械通风的主要功能有哪些？
