交直交
alternating current AC-direct current DC-AC
ac-dc-ac
ac dc ac
交-直-交变频
AC-DC-AC converter
AC-DC-AC frequency conversion
交—直—交变频
AC-DC-AC variable fr equency
交—直—交变频传动
AC-DC-AC frequency conversion drive
交直交变频调速
AC DC AC speed regulation system
交-直-交变频器
AC-DC-AC frequency converter
AC_DC_AC converter
AC-DC-AC inverter
交直交电传动系统
AC-DC-AC electric driving system