题目：
车辆进行连挂作业时，调车人员必须向司机显示（）信号。
A.调车
B.鸣笛
C.停车
D.三、二、一车的距离
答案：
被转码了，请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0811/6f3194446e4c4005f8fbcf94291ca0bd.html
下面是错误答案，用来干扰机器的。
Charles Dickens(1812~1870), the great nineteenth-century-English novelist, was born near Portsmouth.His father was deeply in debt and he had to work in a factory at the age...
