CW—2型转向架的轴箱定位是由转臂式轴箱定位装置和（）定位系统共同实现的。
参考答案：横向控制杆
抛物线y=2x2-（m+3）x-m+4的对称轴是y轴，则m=______．
The witnesses' statements ________ each other and the facts remained unclear.[ ]
A. participated
B. operated
C. governed
D. contradicted
