安装轴箱弹簧时．高度大的弹簧一般装在（）轮对轴箱上。
A.转向架两端
B.转向架中间
C.机车两端
D.机车中间
参考答案：A
下图所示的插头可以连接到PC机主板上的（）接口。
A．COM
B．RJ-45
C．USB
D．PS/2
The murderer was brought in, with his hands _____ behind his back. [ ]
A. being tied
B. having tied
C. to be tied
D. tied
