【电】 phase-veversal switch
in reverse; on the contrary; turn over
【医】 contra-; re-; trans-
each other; mutually; appearance; looks; look at and appraise; photograph
posture
【化】 phase
【医】 phase
on-off; stopcock; switch
【计】 disjunctor; S; SW; switch
【化】 switch
【医】 switch