四极开关隔离
four-pole switch isolation
四极自动转换开关电器
automatic transfer switching equipment(ATSE) with 4 poles
四极-四极力
quadrupole quadrupole force
偶极四极交互作用
dipole-quadrupole interaction
偶极-四极相互作用
dipole-quadrupole interaction
diople-quadrupole interaction
偶极-四极效应
dipole-quadrupole effecty
双向开关四步换流
four-quadrant switches’ four-step commutation
双栅极MOS四极管
double gate MOS four terminal devices
四开关三相
Four-switch Three-phase Inverter