单选题As some countries attempt to shift away from natural gas or petroleum energy systems toward coal-based systems, the need for coal slurry(煤泥) will increase in these countries,（）transport mode will be the first choice for transfer this kind of product.AWater carriageBPipeline transportCRail transportDSurface transport
单选题
As some countries attempt to shift away from natural gas or petroleum energy systems toward coal-based systems, the need for coal slurry(煤泥) will increase in these countries,（）transport mode will be the first choice for transfer this kind of product.
A
Water carriage
B
Pipeline transport
C
Rail transport
D
Surface transport
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