一次性过轨的货车为车号左起第一、二位为（），没有铁路路徽的货车。
A.00
B.01
C.02
D.03
参考答案：A
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All of the following are distress signals under the Rules EXCEPT（）.
A.International Code Signal "AA"
B.orange-colored smoke
C.red flares
D.the repeated raising and lowering of outstretched arms
