【简答题】Listen to a short passage concerning language learning and fill in the missing information. B2U1Compound dictation Homework.ppt What is the best way to learn a new language? A small study of foreign l...
【简答题】It is known that the uniform section of the magnetic path S = 5cm.^2, the average length is L = 100cm = 1m, the relative permeability of the medium is ur = 1000, the number of turns of the iron core ...