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
- 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.
- The<br/>magnetic field lines are used to visually describe the distribution<br/>of the magnetic field around the magnet. For the following<br/>statement,( <br/>) is wrong. A: Each<br/>magnetic field line is a closed loop curve B: No<br/>two magnetic field lines can cross each other C: The<br/>length of the magnetic field line reflects the strength of the<br/>magnetic field D: The<br/>tangential direction of any point on any of the magnetic lines is the<br/>direction of the magnetic field at that point
- When analyzing competition, one should put more emphasis on direct competition than on indirect competition.