The project of railway switch snow protection system based on the principle of the air umbrella, was

The project of railway switch snow protection system based on the principle of the air umbrella, was the second prize winner of the:

A.the First China-US Young Maker Competition

B.the 10th National Competition of Transport Science and Technology for Students

C.the 10th National University Student Social Practice and Science Contest on Energy Saving & Emission Reduction

D.the 6th National Mechanical Innovation Design Competition

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