转向架与车体之间设置的弹性连接装置，称为车体（），又称二系弹簧悬挂装置。
A.牵引装置
B.缓冲装置
C.支承装置
D.调整装置
参考答案：C
The three ______ want to be ______ very much, because they want to catch (抓) ______. [ ]
A. childs, policeman, thiefs
B. children, policeman, thieves
C. children, policemen, thieves
D. child, policewomen, thieves
简述自我管理机制不健全的主要原因？
