（） is a system of unitized multimodal land transportation of transport by road and rail.
- A、Land bridge
- B、Rail/road
- C、Piggyback
- D、Sea/air
正确答案:C
答案解析:有
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国际货运代理
国际货运代理
（） is a system of unitized multimodal land transportation of transport by road and rail.
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