Piggyback is a system of unitized multimodal land transport by ( )

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问题 Piggyback is a system of unitized multimodal land transport by (    )

选项 A、road and sea
B、road and rail
C、road and air
D、road and road

答案B

解析 驮运联运系统是综合了铁路和公路两种运输方式的运输系统,因此答案应该是选B,本题是考试驮运联运所涉及的运输方式
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