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四极 sìjí
gen. quadruple
el.mach. four pole; quadripolar; tetrapolar
met. quadripole; quadrupole
四极 sìjí
gen. fourpole; four-pole
四极系,场,子,器,透镜 sìjí
gen. quadrupole
四极 sìjí
gen. quadripole
四极
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