允许速度Vmax≤120km/h的线路，当钢轨工作边或轨端肥边大于（）时，应及时处理。
A.1mm
B.2mm
C.3mm
D.4mm
参考答案：B
当危险和有害因素存在困难时，尽可能从根本上消除危险和有害因素。
In relation to private companies, explain the meaning of, and the procedure for passing, the following:
(b) a written resolution. (5 marks)
