【Music】
tetrachords(C,G&D),whole and half steps
1.the distance from any key on the keyboard to the very next key above or below it, whether black or white, is a (half step).
2.the distance from any key on the keyboard to 2 keys above or below it is a (whole step).

conductor n. 导体
clockwise
counter-clockwise
conversely
shunt 分流器
galvanometer 检流计
helix 螺旋
permeability 导磁系数
ferromagnetism 磁铁性
induced magnetism 感应磁场
AC generator直流发电机