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commutative semigroup
交换半群
commutative semigroup
commutative semihered...
commutative set
commutative system
commutative unipotent...
commutativity
commutativity interch...
commutativity of disj...
commutativity of mult...
commutator
commutator ammeter
commutator armature
commutator bar
commutator bar assembly
commutator bar pitch
commutator bolt
commutator brush
commutator bush
commutator bushing
commutator circuit
commutator clamping ring
commutator compound
commutator controller
commutator detector
commutator diameter
commutator ear
commutator end felt wick
commutator end frame
commutator end head
commutator face
commutator frequency ...
commutator frequency ...
commutator generator
commutator grinder
commutator group
commutator head
commutator hub
commutator induction ...
commutator insulating...
commutator insulating...
commutator insulating...
commutator insulation
commutator insulator
commutator loss
commutator lug
commutator machine
commutator matrix
commutator modulator
commutator motor
commutator noise
commutator pitch
commutator product
commutator pulse
commutator rectifier
commutator ring
commutator ripple
commutator riser
commutator segment
commutator series
commutator set
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