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- 四four
- 微波四极管microwave tetrode
- 核四极矩共振nuclear quadrupole resonance (NQR)
- 核电四极矩共振nuclear electric quadrupole resonance
- 半导体四极管semiconductor tetrode
- 伪四极pseudoquardrupole
- 电四极electric quadrupole
- 四极场quadrupole field
- 四极的quadripolar
- 四极法four-electrode method
- 四极管tetrode
- 四极矩quadrupole moment
- 四极脉quarternary vein
- 四极源quadrupole source
- 四极种tetrapolar species
- 四极子quadrapole
- 核四极共振nuclear quadrupole resonance (NQR)
- 微波三极管与四极管microwave triode and tetrode
- 四极杆quadrupole bar
- 斜四极磁铁skew quadrupole magnet
