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

正确答案：the 10th National Competition of Transport Science and Technology for Students