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double-base phototransistor
双基极光电晶体管
double-base phototran...
double-base powder
double-base propellant
double-base rocket pr...
double-base transistor
double-battery gin
double-bead
double-bead lap joint
double-beam
double-beam cathode-r...
double-beam densitometer
double-beam double-fo...
double-beam far-infra...
double-beam Fizeau fr...
double-beam oscillograph
double-beam oscilloscope
double-beam photometer
double-beam polarizer
double-beam principle
double-beam recording...
double-beam spectrometer
double-beam spectroph...
double-beam system
double-beam technique
double-beam tube
double-beat drop valve
double-beat valve
double-bed
double-bedded
double-bell
double-bell charging ...
double-bend valve
double-bevel
double-bevel groove
double-bevel groove weld
double-bevelling
double-bit ax
double-bit error
double-blade auger
double-blade axe
double-bladed plough
double-blind
double-block brake
double-blow heading
double-bolt cutter
double-bond isomerism
double-bond shift
double-bore well
double-bottom cellular
double-bounce calibra...
double-bowl vacuum ce...
double-branch bend
double-branch gate
double-break
double-break bridging...
double-break circuit-...
double-break contact
double-break double-m...
double-break jack
double-break switch
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