pad relay衰耗器: attenuator继电器: electric relay; relay衰耗器: pad变压器继电器: transformer relay断路器继电器: cut out relay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:衰耗器继电器,即可在微信中查询翻译