管道运输(Pipeline transport)
A、Railroad transport
B、Air transport
C、Parcel post transport
D、Pipeline transport
A、Inland waterway transport is no longer used in Europe and China.
B、Marine transport is the backbone of international trade and the global economy.
C、Air transport is the most flexible mode of transport among all modes of transport because the speed of delivery is very high.
D、Pipeline transport cannot be used to move goods across national borders.
A、沿程温降速度较输油管快The temperature drop speed along the pipeline is faster
B、下游管道温度低于环境温度The downstream pipeline temperature is lower than the ambient temperature
C、沿程温降速度较输油管慢The temperature drop along the pipeline is slower than that along the pipeline
D、下游管道温度高于环境温度The downstream pipeline temperature is higher than the ambient temperature
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