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manhole cover / Traffic safety

manhole cover

By using the Hooke's law of the spring, according to the change of the manhole cover quality, to judge the damage of the manhole cover. When the well cover the damaged area reaches can make people material down, warning lamp covers a week lit up. Using the white light on the sidewalk, roadway by red light in.

University

兰州理工大学

兰州理工大学
甘肃, China

唐 钊山,
兰州理工大学