允许速度不超过160km/h的线路，无缝线路发生断轨后，进行临时处理时，插入短轨的长度为（）。
A、4.5m
B、6m
C、6.5m
D、7m
参考答案：B
Dear friends, please read every sentence carefully. Details decide ______ or not.
If you take it seriously, you'll achieve your goal! [ ]
A. success
B. successful
C. succeed
今人常用“南青北白”描述唐代陶瓷的概貌。（）是传统青瓷的典范，邢窑是新兴白瓷的代表。
