Assertion: tourmaline's pole | /r/Synonym | permanent electric poles
Facets:
Source sentences:
text: The poles are not extinguished by an external electric field at room temperature and atmospheric pressure, and are thus called permanent electric poles.
text: It is said that tourmaline has permanent electric poles from the onset of its formation.
text: The poles are not extinguished by an external electric field at room temperature and atmospheric pressure, and are thus called permanent electric poles.
text: The poles are not extinguished by an external electric field at room temperature and atmospheric pressure, and are thus called permanent electric poles.