[填空题]
A neuron is stimulated with an electric pulse1e0cn*vjbip - p67m,l (onxfy . T p/vf lb2+ewdg16w-nd he action potential is detected at a point 3.40 cm down the axon 0.0052 s later. When the action potential is detected 7.20 cm from the point of stimulation, the time required is gb wfnd +w6-pelv2 /d10.0063 s. What is the speed of the electric pulse along the axon? (Why are two measurements needed instead of only one?) m/s
