The pole vault is truly the highlight of any track and field competition. It combines the grace of a gymnast with the strength of a body builder.
举一反三
- The magnetic field lines are ( ) curves,The<br/>outer space magnetic field line of the permanent magnet is ( <br/>). <br/>A.close-loop/ A: ). <br/>close-loop/<br/>from B: pole<br/>open-loop/<br/>from C: pole<br/>close-loop/<br/>from D: pole to E: pole to F: pole to G: pole to H: pole<br/>open-loop/<br/>from I: pole
- Which of the following are NOT classified as Athletics? A: pole vault B: cycling C: football (soccer) D: step and jump
- (多选)Which of the following are NOT classified as Athletics? A: pole vault B: cycling C: football (soccer) D: step and jump
- 中国大学MOOC: A conductor in electrostatic field is an equipotential body, any two points on the conductor have the same electric potential.
- A conductor in electrostatic field is an equipotential body, any two points on the conductor have the same electric potential. A: 正确 B: 错误