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特殊等价物
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特殊等价物
special equivalent
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helitron
helitron oscillator
helium
helium age method
helium arc
helium arc welding
helium-atmosphere
helium-atmosphere box
helium backscattering analyzer
helium burning
helium charging unit
helium compressor
helium content
helium coolant
helium-cooled parametric amplifier
helium-cooled reactor
helium dating
helium detector
helium dilution analyser
helium diving bell
helium family element
helium film
helium flash
helium fuel tank pressurization
helium gas
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