Sign up for an Award
Participate with your entry in one of our professional or student awards.
Sign up for an awardLearn more:
Unsupported browser
You are using an outdated browser. Please upgrade your browser to improve your experience.
By connecting and disconnecting lines to illustrate simply and clearly the state of the switch.
Hebei University Of Science And Technology
Shijiazhuang, China
Hebei University Of Science And Technology
Shijiazhuang, China