An experimental unit for measuring instantaneous speed of high speed train passing through tunnel with a photoelectrical switch is designed.
设计了一套采用光电开关测量高速列车进出隧道瞬时速度的实验装置。
An experimental unit for measuring instantaneous speed of high speed train passing through tunnel with a photoelectrical switch is designed.
设计了一套采用光电开关测量高速列车进出隧道瞬时速度的实验装置。
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