问题
单项选择题
The disadvantages of rail compared with motor carrier are（）
A. Cost
B. Speed
C. Lost and damage ratios
D. Transit time and frequency of service
答案
参考答案：C
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The disadvantages of rail compared with motor carrier are（）
A. Cost
B. Speed
C. Lost and damage ratios
D. Transit time and frequency of service
参考答案：C