蛙式夯实机可以进行夯实的地面为( )。
A．灰土、素土地基、地坪B．坚硬或软硬不一的地面C．冻土地面D．混有砖石碎块的杂土
参考答案：A
After the accident I tried whatever I can to help him, but it didn't make any _____. [ ]
A. use
B. difference
C. result
D. case
饮茶的好处与茶叶等级高低有关系吗？
