(20 13? In Linyi simulation, K, L and M are three closely spaced equipotential surfaces in the electrostatic field (there is no charge between K and M). Charged particles (excl. weight)

A, given the potential φ k < φ l < φ m, draw the electric field line as shown in the figure, generally to the left. According to the direction of trajectory bending, the direction of electric field force acting on particles is generally left, so the charge is positively charged. Therefore, A is correct.

B, through the electric field force of potential UL < um, b→c, negative work is done on positive charge, kinetic energy is reduced, and deceleration motion is made. Therefore, B is correct.

C, a and e are on the same equipotential surface, and their potentials are equal. According to the law of conservation of energy, their speed is equal. So, C is correct.

D. when the particle moves from point c to point d, the potential decreases and the electric field force does positive work. So, d is wrong.

So choose ABC ..