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.
Bending broom is convenient and labor-saving .It is designed to clean the corner easly.
Lanzhou University of Technology
Lanzhou, China
yangfeng Zhou,
Lanzhou University of Technology