减震器作用是当汽车受到震动冲击时使震动得到：（）
A.增加
B.消失
C.缓和
参考答案：C
Don’t worry. The blind man to walk across the road soon by the policeman.
A．is helped
B．will be helped
C．was helped
D．has been helped
分组交换网有时也称X.25网，这是为什么？
