two-pole knife switch双极: dipole闸刀开关: knife switch; closing switch ...单极闸刀开关: one pole knife switch; one-pole knife switch; single pole knife switch; single-pole knife switch三极闸刀开关: three pole knife switch; three-pole knife switch串闸刀开关: tandem knife switch; tandem knife-switch; tandem-knife switch下载手机词典可随时随地查词查翻译关注微信公众号：chachacidian，回复:双极闸刀开关，即可在微信中查询翻译
